{"id":801,"date":"2025-10-24T15:04:46","date_gmt":"2025-10-24T07:04:46","guid":{"rendered":"https:\/\/www.youvii.site\/?p=801"},"modified":"2025-10-24T15:09:23","modified_gmt":"2025-10-24T07:09:23","slug":"javascriptjichu","status":"publish","type":"post","link":"https:\/\/www.youvii.site\/index.php\/archives\/javascriptjichu","title":{"rendered":"JavaScript\u57fa\u7840"},"content":{"rendered":"

JavaScript\u57fa\u7840<\/h1>\n

\u6982\u8ff0<\/h1>\n

avaScript \u88ab\u7528\u6765\u6539\u8fdb\u8bbe\u8ba1\u3001\u9a8c\u8bc1\u8868\u5355\u3001\u68c0\u6d4b\u6d4f\u89c8\u5668\u3001\u521b\u5efa cookies\uff0c\u7b49\u7b49 \u3002<\/p>\n

JavaScript \u662f\u56e0\u7279\u7f51\u4e0a\u6700\u6d41\u884c\u7684\u811a\u672c\u8bed\u8a00\uff0c\u5e76\u4e14\u53ef\u5728\u6240\u6709\u4e3b\u8981\u7684\u6d4f\u89c8\u5668\u4e2d\u8fd0\u884c\uff0c<\/p>\n

\u6bd4\u5982\uff1a Internet Explorer\u3001Maxthon\u3001Mozilla\u3001Firefox\u3001Netscape\u3001Chrome \u548c Opera\u7b49\u3002<\/p>\n

\u5e38\u7528 1 \u4fee\u6539 html \u53ca css \u4ee3\u7801 \uff082\uff09\u9a8c\u8bc1\u8868\u5355<\/p>\n

JavaScript\u548cJava\u6ca1\u6709\u5173\u7cfb<\/p>\n

\u5d4c\u5165\u65b9\u6cd5<\/h1>\n

\u5185\u5d4c\u5f0f<\/h2>\n

\u7406\u8bba\u4e0a js \u53ef\u4ee5\u5199\u5728\u4efb\u4f55\u7b2c\u4e00\u4e2a\u5730\u65b9 \u4f46\u662f\u4e00\u822c\u5199\u5728 head \u6807\u7b7e\u91cc\u6216\u8005 body \u4e0b<\/p>\n

<script type=\"application\/javascript\">\nalert(\"\u5185\u5d4c\u5f0f\");\n<\/script>\n<script>alert(\"\u5185\u5d4c\u5f0f\");<\/script><\/code><\/pre>\n
\u5916\u94fe\u5f0f<\/h2>\n
\u9996\u5148\u65b0\u5efa\u4e00\u4e2a\u6587\u4ef6\u7c7b\u578b\u4e3a.js \u7684\u6587\u4ef6\uff0c\u7136\u540e\u5728\u8be5\u6587\u4ef6\u4e2d\u5199 js \u8bed\u53e5\uff0c\u901a\u8fc7 script \u6807<\/p>\n
\u7b7e\u5bf9\u5f15\u5165\u5230 html \u9875\u9762\u4e2d\u3002<\/p>\n
<script src=\"js \u6587\u4ef6\u8def\u5f84\u5730\u5740\">\u8fd9\u91cc\u4e0d\u80fd\u5199 js \u8bed\u53e5<\/script><\/code><\/pre>\n
\u884c\u5185\u5f0f<\/h2>\n
\u76f4\u63a5\u4e66\u5199\u5728\u6807\u7b7e\u8eab\u4e0a\uff0c\u662f\u4e00\u4e2a\u7b80\u5199\u7684\u4e8b\u4ef6\uff0c\u6240\u4ee5\u53c8\u79f0\u4e4b\u4e3a\u4e8b\u4ef6\u5c5e\u6027\u3002 onclick<\/p>\n
\u5355\u51fb\u4e8b\u4ef6<\/p>\n
<input type=\"button\" value=\"\u70b9\u6211\u5440!\" onclick=\"alert('\u6d4b\u8bd5');\">\n<button onclick=\"alert('\u6d4b\u8bd5');\">\u70b9\u6211\u5440!<\/button><\/code><\/pre>\n
\u8bed\u53e5<\/h1>\n
1.\u7f16\u7a0b\u6307\u4ee4\u88ab\u79f0\u4e3a\u8bed\u53e5\u3002<\/p>\n
JavaScript \u7a0b\u5e8f\u5c31\u662f\u4e00\u7cfb\u5217\u7684\u7f16\u7a0b\u8bed\u53e5\u3002<\/p>\n
\u6ce8\u91ca\uff1a\u5728 HTML \u4e2d\uff0cJavaScript \u7a0b\u5e8f\u7531 web \u6d4f\u89c8\u5668\u6267\u884c\u3002<\/p>\n
2.JavaScript \u8bed\u53e5\u7531\u4ee5\u4e0b\u6784\u6210\uff1a<\/p>\n
\u503c\u3001\u8fd0\u7b97\u7b26\u3001\u8868\u8fbe\u5f0f\u3001\u5173\u952e\u8bcd\u548c\u6ce8\u91ca\u3002<\/p>\n
3.\u7528\u5206\u53f7\uff08;\uff09\u5206\u9694 JavaScript \u8bed\u53e5\u3002<\/p>\n
\u6ce8\u91ca<\/h1>\n
\u884c\u6ce8\u91ca\uff1a \/\/ \u6ce8\u91ca\u8bed\u53e5 \u5feb\u6377\u952e ctrl+\/<\/p>\n
\u591a\u884c\u6ce8\u91ca\uff1a \/ \u6ce8\u91ca\u8bed\u53e5 <\/em>\/ \u5feb\u6377\u952e ctrl+shift+\/<\/p>\n
\u6ce8\u610f\uff1a\u591a\u884c\u6ce8\u91ca\u76f8\u4e92\u4e0d\u80fd\u5d4c\u5957\u4f7f\u7528\uff0c\u53ea\u80fd\u5728\u591a\u884c\u6ce8\u91ca\u91cc\u9762\u4f7f\u7528\u5355\u884c\u6ce8\u91ca\uff01<\/p>\n
\u53d8\u91cf<\/h1>\n
\u53d8\u91cf\u662f\u7528\u4e8e\u5b58\u50a8\u4fe1\u606f\u7684"\u5bb9\u5668"<\/p>\n
javascript \u5355\u53cc\u5f15\u53f7\u6ca1\u533a\u522b<\/p>\n
var a=\u2019\u5b57\u7b26\u4e32\u2019;<\/p>\n
JavaScript\u4fdd\u7559\u5173\u952e\u5b57<\/h1>\n
Javascript \u7684\u4fdd\u7559\u5173\u952e\u5b57\u4e0d\u53ef\u4ee5\u7528\u4f5c\u53d8\u91cf\u3001\u6807\u7b7e\u6216\u8005\u51fd\u6570\u540d\u3002\u6709\u4e9b\u4fdd\u7559\u5173\u952e\u5b57\u662f\u4f5c<\/p>\n
\u4e3a Javascript \u4ee5\u540e\u6269\u5c55\u4f7f\u7528\u3002<\/p>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u4fdd\u7559\u5173\u952e\u5b57<\/th>\n<\/tr>\n<\/thead>\n
abstract<\/td>\n<\/tr>\n
arguments<\/td>\n<\/tr>\n
await*<\/td>\n<\/tr>\n
boolean<\/td>\n<\/tr>\n
break<\/td>\n<\/tr>\n
byte<\/td>\n<\/tr>\n
case<\/td>\n<\/tr>\n
catch<\/td>\n<\/tr>\n
char<\/td>\n<\/tr>\n
class*<\/td>\n<\/tr>\n
const<\/td>\n<\/tr>\n
continue<\/td>\n<\/tr>\n
debugger<\/td>\n<\/tr>\n
default<\/td>\n<\/tr>\n
delete<\/td>\n<\/tr>\n
do<\/td>\n<\/tr>\n
double<\/td>\n<\/tr>\n
else<\/td>\n<\/tr>\n
enum*<\/td>\n<\/tr>\n
eval<\/td>\n<\/tr>\n
export*<\/td>\n<\/tr>\n
extends*<\/td>\n<\/tr>\n
false<\/td>\n<\/tr>\n
final<\/td>\n<\/tr>\n
finally<\/td>\n<\/tr>\n
float<\/td>\n<\/tr>\n
for<\/td>\n<\/tr>\n
function<\/td>\n<\/tr>\n
goto<\/td>\n<\/tr>\n
if<\/td>\n<\/tr>\n
implements<\/td>\n<\/tr>\n
import*<\/td>\n<\/tr>\n
in<\/td>\n<\/tr>\n
instanceof<\/td>\n<\/tr>\n
int<\/td>\n<\/tr>\n
interface<\/td>\n<\/tr>\n
let*<\/td>\n<\/tr>\n
long<\/td>\n<\/tr>\n
native<\/td>\n<\/tr>\n
new<\/td>\n<\/tr>\n
null<\/td>\n<\/tr>\n
package<\/td>\n<\/tr>\n
private<\/td>\n<\/tr>\n
protected<\/td>\n<\/tr>\n
public<\/td>\n<\/tr>\n
return<\/td>\n<\/tr>\n
short<\/td>\n<\/tr>\n
static<\/td>\n<\/tr>\n
super*<\/td>\n<\/tr>\n
switch<\/td>\n<\/tr>\n
synchronized<\/td>\n<\/tr>\n
this<\/td>\n<\/tr>\n
throw<\/td>\n<\/tr>\n
throws<\/td>\n<\/tr>\n
transient<\/td>\n<\/tr>\n
true<\/td>\n<\/tr>\n
try<\/td>\n<\/tr>\n
typeof<\/td>\n<\/tr>\n
var<\/td>\n<\/tr>\n
void<\/td>\n<\/tr>\n
volatile<\/td>\n<\/tr>\n
while<\/td>\n<\/tr>\n
with<\/td>\n<\/tr>\n
yield<\/td>\n<\/tr>\n
\u6ce8\u610f\uff1a\u5e26\u661f\u53f7(*)\u6807\u6ce8\u7684\u5173\u952e\u5b57\u662f\u5728ES6(ES2015)\u6216\u4e4b\u540e\u7684\u7248\u672c\u4e2d\u5f15\u5165\u7684\u3002\u5176\u4e2dawait<\/code>\u548cyield<\/code>\u53ea\u80fd\u5728\u7279\u5b9a\u4e0a\u4e0b\u6587\u4e2d\u4f7f\u7528\uff08\u5982\u751f\u6210\u5668\u51fd\u6570\u5185\uff09\u3002\u6b64\u5916\uff0c\u867d\u7136enum<\/code>\u88ab\u5217\u5728\u8fd9\u91cc\uff0c\u4f46\u5b83\u5e76\u4e0d\u662f\u4e00\u4e2a\u771f\u6b63\u7684\u4fdd\u7559\u5b57\uff1b\u5b83\u53ef\u4ee5\u901a\u8fc7--allowReserved<\/code>\u9009\u9879\u5728\u67d0\u4e9b\u73af\u5883\u4e2d\u4f7f\u7528\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n
\u4f5c\u7528\u57df<\/h1>\n
\u5c40\u90e8\u53d8\u91cf<\/h2>\n
\u5c40\u90e8\u4f5c\u7528\u57df \u53d8\u91cf\u5728\u51fd\u6570\u5185\u58f0\u660e\uff0c\u53d8\u91cf\u4e3a\u5c40\u90e8\u4f5c\u7528\u57df\u3002<\/p>\n
function myFunction() {\nvar carName = \"Volvo\";\n\/\/ \u51fd\u6570\u5185\u53ef\u8c03\u7528 carName \u53d8\u91cf\n}<\/code><\/pre>\n
\u5168\u5c40\u53d8\u91cf<\/h2>\n
\u53d8\u91cf\u5728\u51fd\u6570\u5916\u5b9a\u4e49\uff0c\u5373\u4e3a\u5168\u5c40\u53d8\u91cf\u3002<\/p>\n
\u5168\u5c40\u53d8\u91cf\u6709 \u5168\u5c40\u4f5c\u7528\u57df: \u7f51\u9875\u4e2d\u6240\u6709\u811a\u672c\u548c\u51fd\u6570\u5747\u53ef\u4f7f\u7528\u3002<\/p>\n
var carName = \" Volvo\";\n\/\/ \u6b64\u5904\u53ef\u8c03\u7528 carName \u53d8\u91cf\nfunction myFunction() {\n\/\/ \u51fd\u6570\u5185\u53ef\u8c03\u7528 carName \u53d8\u91cf\n}<\/code><\/pre>\n
\u6570\u636e\u7c7b\u578b<\/h1>\n
\u6570\u503c\u578b\uff1anumber\uff08\u51e1\u662f\u6570\u5b57\u90fd\u662f\u6570\u503c\u578b\uff0c\u4e0d\u533a\u5206\u6574\u6570\u548c\u5c0f\u6570\uff09<\/p>\n
\u5b57\u7b26\u4e32\uff1astring\uff08\u51e1\u662f\u5f15\u53f7\u5305\u88f9\u8d77\u6765\u7684\u5185\u5bb9\u5168\u90e8\u90fd\u662f\u5b57\u7b26\u4e32\uff09<\/p>\n
\u5e03\u5c14\uff1aboolean\uff08true\u3001false\uff09<\/p>\n
\u5bf9\u8c61\u7c7b\u578b\uff1aobject\uff08\u7279\u6b8a\u53d6\u503c null\uff09<\/p>\n
\u672a\u5b9a\u4e49\u578b\uff1aundefined<\/p>\n
\u5bf9\u8c61\u7c7b\u578b \u6570\u7ec4 \u5b57\u5178<\/p>\n
\u5224\u65ad\u7c7b\u578b<\/h1>\n
var a = "iamstring.";<\/p>\n
var b = 222;<\/p>\n
var c= [1,2,3];<\/p>\n
var d = new Date();<\/p>\n
var e = function(){alert(111);};<\/p>\n
var f = function(){this.name="22";};<\/p>\n
alert(typeof a) ————> string<\/p>\n
alert(typeof b) ————> number<\/p>\n
alert(typeof c) ————> object<\/p>\n
alert(typeof d) ————> object<\/p>\n
alert(typeof e) ————> function<\/p>\n
alert(typeof f) ————> function<\/p>\n
\u6570\u5b57\u7c7b\u578b<\/h1>\n
\u53ea\u6709\u4e00\u79cd\u6570\u5b57\u7c7b\u578b\uff0c\u6570\u5b57 \u53ef\u4ee5\u662f\u5c0f\u6570 \uff0c\u4e5f\u53ef\u4ee5\u7684\u6574\u6570<\/p>\n
\u4ee5 0 \u5f00\u5934 \u9ed8\u8ba4\u4f7f\u7528 8 \u8fdb\u5236\u6765\u8868\u793a\u6211\u7684\u8fd9\u4e2a\u6570\u5b57<\/p>\n
\u4ee5 0x \u5f00\u5934 \u9ed8\u8ba4\u4f7f\u7528 16 \u8fdb\u5236\u6765\u8868\u8ff0\u6211\u7684\u8fd9\u4e2a\u6570\u5b57<\/p>\n
\u5982\u679c\u4ee5-\u5f00\u5934 \u9ed8\u8ba4\u4ee5\u8d1f\u6570<\/p>\n
\u5982\u679c\u6211\u5e26\u6709 e\uff1a\u4ee5\u79d1\u5b66\u8ba1\u6570\u6cd5\u6765\u89e3\u6790\u6211\u7684\u8fd9\u4e2a\u6570\u5b57<\/p>\n
parseInt(..) \u5c06\u67d0\u503c\u8f6c\u6362\u6210\u6570\u5b57\uff0c\u4e0d\u6210\u529f\u5219 NaN<\/p>\n
parseFloat(..) \u5c06\u67d0\u503c\u8f6c\u6362\u6210\u6d6e\u70b9\u6570\uff0c\u4e0d\u6210\u529f\u5219 NaN<\/p>\n
\u7279\u6b8a\u503c\uff1a<\/p>\n
NaN\uff0c\u975e\u6570\u5b57\u3002\u53ef\u4f7f\u7528 isNaN(num) \u6765\u5224\u65ad\u3002<\/p>\n
Infinity\uff0c\u65e0\u7a77\u5927\u3002\u53ef\u4f7f\u7528 isFinite(num) \u6765\u5224\u65ad\u3002<\/p>\n
\u5b57\u7b26\u4e32\u578b<\/h1>\n
\u5b57\u7b26\u4e32\u662f\u5b58\u50a8\u5b57\u7b26\u7684\u53d8\u91cf\uff0c\u7528\u6765\u8868\u793a\u6587\u672c\u7684\u6570\u636e\u7c7b\u578b\uff0c\u7a0b\u5e8f\u4e2d\u7684\u5b57\u7b26\u4e32\u662f\u5305\u542b<\/p>\n
\u5355\u5f15\u53f7\/\u53cc\u5f15\u53f7\u7684\uff0c\u7531\u5355\u5f15\u53f7\u6765\u754c\u5b9a\u6211\u53cc\u5f15\u53f7\u4e2d\u5305\u542b\u7684\u5b57\u7b26\u4e32<\/p>\n
obj.length \u957f\u5ea6<\/p>\n
obj.trim() \u79fb\u9664\u7a7a\u767d<\/p>\n
obj.trimLeft()<\/p>\n
obj.trimRight)<\/p>\n
obj.charAt(n) \u8fd4\u56de\u5b57\u7b26\u4e32\u4e2d\u7684\u7b2c n \u4e2a\u5b57\u7b26<\/p>\n
obj.concat(value, …) \u62fc\u63a5<\/p>\n
obj.indexOf(substring,start) \u5b50\u5e8f\u5217\u4f4d\u7f6e<\/p>\n
obj.lastIndexOf(substring,start) \u5b50\u5e8f\u5217\u4f4d\u7f6e<\/p>\n
obj.substring(from, to) \u6839\u636e\u7d22\u5f15\u83b7\u53d6\u5b50\u5e8f\u5217<\/p>\n
obj.slice(<\/p>\n
, end) \u5207\u7247<\/p>\n
obj.toLowerCase() \u5927\u5199<\/p>\n
obj.toUpperCase() \u5c0f\u5199<\/p>\n
obj.split(delimiter, limit) \u5206\u5272<\/p>\n
obj.search(regexp) \u4ece\u5934\u5f00\u59cb\u5339\u914d\uff0c\u8fd4\u56de\u5339\u914d\u6210\u529f\u7684\u7b2c\u4e00\u4e2a\u4f4d\u7f6e(g \u65e0\u6548)<\/p>\n
obj.match(regexp) \u5168\u5c40\u641c\u7d22\uff0c\u5982\u679c\u6b63\u5219\u4e2d\u6709 g \u8868\u793a\u627e\u5230\u5168\u90e8\uff0c\u5426\u5219\u53ea<\/p>\n
\u627e\u5230\u7b2c\u4e00\u4e2a\u3002<\/p>\n
obj.replace(regexp, replacement) \u66ff\u6362\uff0c\u6b63\u5219\u4e2d\u6709 g \u5219\u66ff\u6362\u6240\u6709\uff0c\u5426\u5219\u53ea\u66ff\u6362\u7b2c<\/p>\n
\u4e00\u4e2a\u5339\u914d\u9879\uff0c<\/p>\n
$\u6570\u5b57\uff1a\u5339\u914d\u7684\u7b2c n \u4e2a\u7ec4\u5185\u5bb9\uff1b<\/p>\n
$&\uff1a\u5f53\u524d\u5339\u914d\u7684\u5185\u5bb9\uff1b<\/p>\n
$`\uff1a\u4f4d\u4e8e\u5339\u914d\u5b50\u4e32\u5de6\u4fa7\u7684\u6587\u672c\uff1b<\/p>\n
$’\uff1a\u4f4d\u4e8e\u5339\u914d\u5b50\u4e32\u53f3\u4fa7\u7684\u6587\u672c<\/p>\n
$$\uff1a\u76f4\u63a5\u91cf$\u7b26\u53f7<\/p>\n
\u5e03\u5c14\u7c7b\u578b<\/h1>\n
\u4e00\u822c\u662f\u7528\u5728\u6d41\u7a0b\u63a7\u5236\u8bed\u53e5\u4e2d\uff0c\u5b57\u7b26\u4e32\u548c\u6570\u5b57\u7c7b\u578b\u90fd\u662f\u65e0\u7a77\u591a\u4e2a\uff0c\u7136\u800c\u6211\u4eec\u7684\u5e03<\/p>\n
\u5c14\u6570\u636e\u7c7b\u578b\u53ea\u6709\u4e24\u4e2a\uff1atrue \u548c false<\/p>\n
\u8fd9\u4e24\u4e2a\u4e2a\u503c\u4e00\u822c\u7528\u4e8e\u8bf4\u660e\u67d0\u4e2a\u4e8b\u7269\u662f\u771f\u6216\u8005\u5047<\/p>\n
js \u4e00\u822c\u7528\u5e03\u5c14\u7c7b\u578b\u6765\u6bd4\u8f83\u6240\u5f97\u5230\u7684\u7ed3\u679c<\/p>\n
\u5e03\u5c14\u7c7b\u578b\u4ec5\u5305\u542b\u771f\u5047\uff0c<\/p>\n
== \u6bd4\u8f83\u503c\u76f8\u7b49<\/p>\n
!= \u4e0d\u7b49\u4e8e<\/p>\n
=== \u6bd4\u8f83\u503c\u548c\u7c7b\u578b\u76f8\u7b49<\/p>\n
!=== \u4e0d\u7b49\u4e8e<\/p>\n
|| \u6216<\/p>\n
&& \u4e14<\/p>\n
null<\/h1>\n
null<\/p>\n
\u5173\u952e\u5b57 null \u662f\u4e00\u4e2a\u7279\u6b8a\u7684\u503c\uff0c\u5b83\u8868\u793a\u53d8\u91cf\u4e3a\u7a7a\u503c\uff0c\u7528\u6765\u5b9a\u4e49\u7a7a\u7684\u6216\u8005\u662f\u4e0d\u5b58\u5728<\/p>\n
\u7684\u5f15\u7528\u3002<\/p>\n
\u5982\u679c\u8bd5\u56fe\u53bb\u5f15\u7528\u4e00\u4e2a\u6ca1\u6709\u5b9a\u4e49\u7684\u503c\uff0c\u5c31\u4f1a\u8fd4\u56de\u4e00\u4e2a null\u3002<\/p>\n
\u8fd9\u91cc\u6ce8\u610f\u4e00\u70b9\uff1anull \u5e76\u4e0d\u7b49\u4e8e"" \u6216\u8005 0<\/p>\n
undefined<\/h1>\n
\u8fd9\u4e2a\u503c\u8868\u793a\u53d8\u91cf\u4e0d\u542b\u6709\u503c\uff0c\u6ca1\u6709\u5b9a\u4e49\u7684\u503c\uff0c\u6216\u8005\u88ab\u5b9a\u4e49\u4e86\u4e00\u4e2a\u4e0d\u5b58\u5728\u7684\u5c5e\u6027\u503c<\/p>\n
\uff01null \u548c undefined \u533a\u522b\uff1a<\/p>\n
null \u5b83\u8868\u793a\u4e00\u4e2a\u53d8\u91cf\u88ab\u8d4b\u4e88\u4e00\u4e2a\u7a7a\u503c\uff0c\u800c undefined \u662f\u8868\u793a\u53d8\u91cf\u8fd8\u6ca1\u6709\u88ab\u8d4b\u503c<\/p>\n
\u6570\u7ec4<\/h1>\n
1\u3001\u6570\u7ec4\u5185\u53ef\u4ee5\u5b58\u653e\u4efb\u610f\u6570\u636e\u7c7b\u578b\u7684\u6570\u636e\uff08\u672c\u8d28\u4e0a\u5b83\u4e5f\u662f\u5bf9\u8c61\uff09<\/p>\n
2\u3001\u6570\u7ec4\u5143\u7d20\u4e0d\u8d4b\u503c\u7684\u60c5\u51b5\u4e0b \u503c\u4e3a undefined<\/p>\n
3\u3001\u5982\u679c\u6570\u7ec4\u6253\u5370\u7684\u65f6\u5019\uff0c\u5143\u7d20\u4e0d\u8d4b\u503c""<\/p>\n
4\u3001\u8bbf\u95ee\u6570\u7ec4\u8303\u56f4\u4e4b\u5916\u7684\u5143\u7d20\uff0c\u4e0d\u4f1a\u51fa\u73b0\u8d8a\u754c\u7684\u95ee\u9898\uff0cundefined<\/p>\n
5\u3001\u5b9a\u4e49\u6570\u7ec4\u5927\u5c0f\uff0c\u7167\u6837\u53ef\u4ee5\u6dfb\u52a0\u66f4\u591a\u5143\u7d20<\/p>\n
\u5b9a\u4e49\u6570\u7ec4\u7684\u65b9\u6cd5<\/h2>\n
1\u3001var arr=[]\/\/\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u6570\u7ec4<\/p>\n
2\u3001var arr=[10,20,{"name":"tomy","age":19},0.1,"string",true,["aaa","bbb"]]\/\/\u5b9a\u4e49\u7684<\/p>\n
\u540c\u65f6\u8d4b\u503c<\/p>\n
3\u3001var arr=new Array();\/\/\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u6570\u7ec4<\/p>\n
4\u3001var arr = new Array(10,20,{"name":"tomy","age":19},0.1,"string",true,<\/p>\n
["aaa","bbb"])\/\/\u5b9a\u4e49\u7684\u540c\u65f6\u8d4b\u503c<\/p>\n
5\u3001var arr=new Array(10)\/\/\u5b9a\u4e49\u4e00\u4e2a\u957f\u5ea6\u4e3a 10 \u7684\u6570\u7ec4<\/p>\n
\u6570\u7ec4\u7684\u64cd\u4f5c<\/h2>\n
obj.length \u6570\u7ec4\u7684\u5927\u5c0f<\/p>\n
obj.push(ele) \u5c3e\u90e8\u8ffd\u52a0\u5143\u7d20<\/p>\n
obj.pop() \u5c3e\u90e8\u83b7\u53d6\u4e00\u4e2a\u5143\u7d20<\/p>\n
obj.unshift(ele) \u5934\u90e8\u63d2\u5165\u5143\u7d20<\/p>\n
obj.shift() \u5934\u90e8\u79fb\u9664\u5143\u7d20<\/p>\n
obj.splice(start, deleteCount, value, …) \u63d2\u5165\u3001\u5220\u9664\u6216\u66ff\u6362\u6570\u7ec4\u7684\u5143\u7d20<\/p>\n
obj.splice(n,0,val) \u6307\u5b9a\u4f4d\u7f6e\u63d2\u5165\u5143\u7d20<\/p>\n
obj.splice(n,1,val) \u6307\u5b9a\u4f4d\u7f6e\u66ff\u6362\u5143\u7d20<\/p>\n
obj.splice(n,1) \u6307\u5b9a\u4f4d\u7f6e\u5220\u9664\u5143\u7d20<\/p>\n
obj.slice( ) \u5207\u7247<\/p>\n
obj.reverse( ) \u53cd\u8f6c<\/p>\n
obj.join(sep) \u5c06\u6570\u7ec4\u5143\u7d20\u8fde\u63a5\u8d77\u6765\u4ee5\u6784\u5efa\u4e00\u4e2a\u5b57\u7b26\u4e32<\/p>\n
obj.concat(val,..) \u8fde\u63a5\u6570\u7ec4<\/p>\n
obj.sort( ) \u5bf9\u6570\u7ec4\u5143\u7d20\u8fdb\u884c\u6392\u5e8f<\/p>\n
\u51fd\u6570<\/h1>\n
JavaScript \u51fd\u6570\u8bed\u6cd5<\/p>\n
JavaScript \u51fd\u6570\u901a\u8fc7 function \u5173\u952e\u8bcd\u8fdb\u884c\u5b9a\u4e49\uff0c\u5176\u540e\u662f\u51fd\u6570\u540d\u548c\u62ec\u53f7 ()\u3002<\/p>\n
\u51fd\u6570\u540d\u53ef\u5305\u542b\u5b57\u6bcd\u3001\u6570\u5b57\u3001\u4e0b\u5212\u7ebf\u548c\u7f8e\u5143\u7b26\u53f7\uff08\u89c4\u5219\u4e0e\u53d8\u91cf\u540d\u76f8\u540c\uff09\u3002<\/p>\n
\u5706\u62ec\u53f7\u53ef\u5305\u62ec\u7531\u9017\u53f7\u5206\u9694\u7684\u53c2\u6570\uff1a<\/p>\n
var x = myFunction(7, 8); \/\/ \u8c03\u7528\u51fd\u6570\uff0c\u8fd4\u56de\u503c\u88ab\u8d4b\u503c\u7ed9 x\nfunction myFunction(a, b) {\nreturn a * b; \/\/ \u51fd\u6570\u8fd4\u56de a \u548c b \u7684\u4e58\u79ef\n}<\/code><\/pre>\n
\u666e\u901a\u51fd\u6570<\/strong><\/p>\n
function func(arg){\nreturn arg+1;\n}\nvar result = func(1);\nconsole.log(result); var result = func(1);\nconsole.log(result);<\/code><\/pre>\n
\u533f\u540d\u51fd\u6570\uff08\u6ca1\u6709\u540d\u5b57\u7684\u51fd\u6570\uff09<\/strong><\/p>\n
setInterval(function(){\nconsole.log(123);\n},500)<\/code><\/pre>\n
\u81ea\u6267\u884c\u51fd\u6570\uff08\u521b\u5efa\u51fd\u6570\u5e76\u81ea\u52a8\u6267\u884c\uff09<\/strong><\/p>\n
(function(arg){\nconsole.log(arg);\n})(1);<\/code><\/pre>\n
\u5b57\u5178<\/h1>\n
\u5b57\u5178 \u662f\u4e00\u79cd\u4ee5\u952e-\u503c\u5bf9\u5f62\u5f0f\u5b58\u50a8\u6570\u636e\u7684\u6570\u636e\u7ed3\u6784<\/p>\n
var dict = {‘k1′:"moonsec",’k2′:’moon’,’age’:18};<\/p>\n
\u8f93\u51fa\u5b57\u5178\u5143\u7d20<\/p>\n
for(var item in dict){<\/p>\n
console.log(dict[item]);<\/p>\n
}<\/p>\n
\u83b7\u53d6\u6307\u5b9a\u5143\u7d20<\/p>\n
dict[‘age’] \u83b7\u53d6 key \u4e3a age \u7684\u5143\u7d20<\/p>\n
\u8d4b\u503c<\/p>\n
dict[‘age’]=10<\/p>\n
\u5220\u9664\u5143\u7d20<\/p>\n
delete dict[‘one’];<\/p>\n
delete dict.age;<\/p>\n
JS\u7684\u5e8f\u5217\u5316\u548c\u53cd\u5e8f\u5217\u5316<\/h1>\n
Json \u4e0e\u5b57\u7b26\u4e32\u7684\u8f6c\u6362<\/p>\n
\u628a\u5bf9\u8c61\u8f6c\u4e3a\u5b57\u7b26\u4e32<\/p>\n
JSON.stringify()<\/p>\n
\u628a\u5b57\u7b26\u4e32\u8f6c\u4e3a\u6570\u7ec4<\/p>\n
newli = JSON.parse()<\/p>\n
\u5e8f\u5217\u5316 \u5373 js \u4e2d\u7684 Object \u8f6c\u5316\u4e3a\u5b57\u7b26\u4e32<\/p>\n
\u4f7f\u7528 toJSONString<\/p>\n
var last=obj.toJSONString(); \/\/\u5c06 JSON \u5bf9\u8c61\u8f6c\u5316\u4e3a JSON \u5b57\u7b26<\/p>\n
\u4f7f\u7528 stringify<\/p>\n
var last=JSON.stringify(obj); \/\/\u5c06 JSON \u5bf9\u8c61\u8f6c\u5316\u4e3a JSON \u5b57\u7b26<\/p>\n
\u53cd\u5e8f\u5217\u5316 \u5373 js \u4e2d JSON \u5b57\u7b26\u4e32\u8f6c\u5316\u4e3a Object<\/p>\n
\u8f6c\u4e49<\/h1>\n
decodeURI( ) URl \u4e2d\u672a\u8f6c\u4e49\u7684\u5b57\u7b26<\/p>\n
decodeURIComponent( ) URI \u7ec4\u4ef6\u4e2d\u7684\u672a\u8f6c\u4e49\u5b57\u7b26<\/p>\n
encodeURI( ) URI \u4e2d\u7684\u8f6c\u4e49\u5b57\u7b26<\/p>\n
encodeURIComponent( ) \u8f6c\u4e49 URI \u7ec4\u4ef6\u4e2d\u7684\u5b57\u7b26<\/p>\n
escape( ) \u5bf9\u5b57\u7b26\u4e32\u8f6c\u4e49<\/p>\n
unescape( ) \u7ed9\u8f6c\u4e49\u5b57\u7b26\u4e32\u89e3\u7801<\/p>\n
URIError \u7531 URl \u7684\u7f16\u7801\u548c\u89e3\u7801\u65b9\u6cd5\u629b\u51fa<\/p>\n
eval<\/h1>\n
eval() \u51fd\u6570\u53ef\u8ba1\u7b97\u67d0\u4e2a\u5b57\u7b26\u4e32\uff0c\u5e76\u6267\u884c\u5176\u4e2d\u7684\u7684 JavaScript \u4ee3\u7801\u3002<\/p>\n
\u65f6\u95f4<\/h1>\n
Date \u5bf9\u8c61<\/p>\n
var myDate = new Date();<\/p>\n
myDate.getYear(); \/\/\u83b7\u53d6\u5f53\u524d\u5e74\u4efd(2 \u4f4d)<\/p>\n
myDate.getFullYear(); \/\/\u83b7\u53d6\u5b8c\u6574\u7684\u5e74\u4efd(4 \u4f4d,1970-????)<\/p>\n
myDate.getMonth(); \/\/ \u83b7 \u53d6 \u5f53 \u524d \u6708 \u4efd (0-11,0 \u4ee3 \u8868 1 \u6708 ) \u6240 \u4ee5 \u83b7 \u53d6 \u5f53 \u524d \u6708 \u4efd \u662f<\/p>\n
myDate.getMonth()+1;<\/p>\n
myDate.getDate(); \/\/\u83b7\u53d6\u5f53\u524d\u65e5(1-31)<\/p>\n
myDate.getDay(); \/\/\u83b7\u53d6\u5f53\u524d\u661f\u671f X(0-6,0 \u4ee3\u8868\u661f\u671f\u5929)<\/p>\n
myDate.getTime(); \/\/\u83b7\u53d6\u5f53\u524d\u65f6\u95f4(\u4ece 1970.1.1 \u5f00\u59cb\u7684\u6beb\u79d2\u6570)<\/p>\n
myDate.getHours(); \/\/\u83b7\u53d6\u5f53\u524d\u5c0f\u65f6\u6570(0-23)<\/p>\n
myDate.getMinutes(); \/\/\u83b7\u53d6\u5f53\u524d\u5206\u949f\u6570(0-59)<\/p>\n
myDate.getSeconds(); \/\/\u83b7\u53d6\u5f53\u524d\u79d2\u6570(0-59)<\/p>\n
myDate.getMilliseconds(); \/\/\u83b7\u53d6\u5f53\u524d\u6beb\u79d2\u6570(0-999)<\/p>\n
myDate.toLocaleDateString(); \/\/\u83b7\u53d6\u5f53\u524d\u65e5\u671f<\/p>\n
var mytime = myDate.toLocaleTimeString(); \/\/\u83b7\u53d6\u5f53\u524d\u65f6\u95f4<\/p>\n
myDate.toLocaleString( ); \/\/\u83b7\u53d6\u65e5\u671f\u4e0e\u65f6\u95f4<\/p>\n
\u52a0\u4e00\u5929<\/p>\n
var dateTime = new Date();<\/p>\n
dateTime=dateTime.setDate(dateTime.getDate()+1);<\/p>\n
dateTime=new Date(dateTime);<\/p>\n
dateTime=dateTime.setDate(dateTime.getDate()+1);<\/p>\n
\u9762\u5411\u5bf9\u8c61<\/h1>\n
JavaScript \u662f\u4e00\u79cd\u57fa\u4e8e\u539f\u578b\u7684\u8bed\u8a00\uff0c\u5b83\u6ca1\u7c7b\u7684\u58f0\u660e\u8bed\u53e5\uff0c\u6bd4\u5982 C+ +\u6216 Java \u4e2d\u7528<\/p>\n
\u7684\u3002\u8fd9\u6709\u65f6\u4f1a\u5bf9\u4e60\u60ef\u4f7f\u7528\u6709\u7c7b\u7533\u660e\u8bed\u53e5\u8bed\u8a00\u7684\u7a0b\u5e8f\u5458\u4ea7\u751f\u56f0\u6270\u3002\u76f8\u53cd\uff0cJavaScript<\/p>\n
\u53ef\u7528\u65b9\u6cd5\u4f5c\u7c7b\u3002\u5b9a\u4e49\u4e00\u4e2a\u7c7b\u8ddf\u5b9a\u4e49\u4e00\u4e2a\u51fd\u6570\u4e00\u6837\u7b80\u5355\u3002\u5728\u4e0b\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u5b9a<\/p>\n
\u4e49\u4e86\u4e00\u4e2a\u65b0\u7c7b Person\u3002<\/p>\n
\u65b9\u6cd5\u4e00<\/h2>\n
function Person(name) {\n\/\/\u6784\u9020\u51fd\u6570\u91cc\u9762\u7684\u65b9\u6cd5\u548c\u5c5e\u6027\nthis._name = name;\nthis.getName = function () {\nconsole.log(this._name);\n};\nthis.setName = function (name) {\nthis._name = name;\n};\n}\nvar p = new Person(\"\u5f20\u4e09\");\np.getName(); \/\/ \u5f20\u4e09\np.setName(\"\u674e\u56db\");\np.getName(); \/\/ \u674e\u56db<\/code><\/pre>\n
\u5bf9\u4e8e\u4e0a\u8ff0\u4ee3\u7801\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n
Person \u5145\u5f53\u7684\u6784\u9020\u51fd\u6570<\/p>\n
this \u4ee3\u6307\u5bf9\u8c61<\/p>\n
\u521b\u5efa\u5bf9\u8c61\u65f6\u9700\u8981\u4f7f\u7528 new<\/p>\n
\u65b9\u6cd5\u4e8c<\/h2>\n
\/\/ \u5b9a\u4e49\u7c7b class Person {\n\/\/\u7c7b\u7684\u6784\u9020\u51fd\u6570\uff0c\u5b9e\u4f8b\u5316\u7684\u65f6\u5019\u6267\u884c\uff0cnew \u7684\u65f6\u5019\u6267\u884c\nconstructor(name) {\nthis._name = name;\n}\ngetName() {\nconsole.log(this._name);\n}\nsetName(name) {\nthis._name = name\n}\n}\nlet p = new Preson('\u5f20\u4e09')\np.getName(); \/\/ \u5f20\u4e09\np.setName('\u674e\u56db');\np.getName(); \/\/ \u674e\u56db<\/code><\/pre>\n
\u539f\u578b<\/h1>\n
\u6211\u4eec\u6240\u521b\u5efa\u7684\u6bcf\u4e00\u4e2a\u51fd\u6570\uff0c\u89e3\u6790\u5668\u90fd\u4f1a\u5411\u51fd\u6570\u4e2d\u6dfb\u52a0\u4e00\u4e2a\u5c5e\u6027 prototype<\/p>\n
\u8fd9\u4e2a\u5c5e\u6027\u5bf9\u5e94\u7740\u4e00\u4e2a\u5bf9\u8c61\uff0c\u8fd9\u4e2a\u5bf9\u8c61\u5c31\u662f\u6211\u4eec\u6240\u8c13\u7684\u539f\u578b\u5bf9\u8c61<\/p>\n
\u5982\u679c\u51fd\u6570\u4f5c\u4e3a\u666e\u901a\u51fd\u6570\u8c03\u7528\u65f6 prototype \u6ca1\u6709\u4efb\u4f55\u4f5c\u7528<\/p>\n
\u5f53\u51fd\u6570\u4ee5\u6784\u9020\u51fd\u6570\u8c03\u7528\u65f6\uff0c\u5b83\u6240\u521b\u5efa\u7684\u5bf9\u8c61\u4e2d\u90fd\u4f1a\u6709\u4e00\u4e2a\u9690\u542b\u7684\u7684\u5c5e\u6027<\/p>\n
\u6307\u5411\u8be5\u6784\u9020\u51fd\u6570\u7684\u539f\u578b \u6211\u4eec\u53ef\u4ee5\u901a\u8fc7proto<\/strong>\u6765\u8bbf\u95ee\u8be5\u5c5e\u6027<\/p>\n
\u6211\u4eec\u53ef\u4ee5\u5c06\u5bf9\u8c61\u4e2d\u516c\u6709\u7684\u5185\u5bb9\uff0c\u7edf\u4e00\u8bbe\u7f6e\u5230\u539f\u578b\u5bf9\u8c61\u4e2d<\/p>\n
function Persion(username,age){\n}\n\/\/console.log(Persion.prototype);\nvar p = new Persion();\nconsole.log(p.__proto__ == Persion.prototype);<\/code><\/pre>\n
\u5b9a\u4e49\u539f\u578b\u53d8\u91cf\u548c\u539f\u578b\u53d8\u91cf<\/p>\n
function Persion(username,age){\n}\n\/\/console.log(Persion.prototype);\nPersion.prototype.a = '\u5973';\nPersion.prototype.Sayname=function(){\nreturn Persion.name;\n}\nvar p1 = new Persion('moonsec');\nvar p2 = new Persion();\nalert(p1.Sayname());<\/code><\/pre>\n
\u8fd0\u7b97\u7b26<\/h1>\n
\u7528\u4e8e\u6267\u884c\u7a0b\u5e8f\u4ee3\u7801\u8fd0\u7b97\uff0c\u4f1a\u9488\u5bf9\u4e00\u4e2a\u4ee5\u4e0a\u64cd\u4f5c\u6570\u6765\u8fdb\u884c<\/p>\n
\u7b97\u6570\u8fd0\u7b97\u7b26<\/h2>\n
    \n
  • \n
      \n
    • \n
        \n
      • \/ % ++ —<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
        \u5b57\u7b26\u4e32\u62fc\u63a5\u4f7f\u7528\u201c+\u201d<\/p>\n
        \u6bd4\u8f83\u8fd0\u7b97\u7b26<\/h2>\n
        <<\/p>\n
        <\/blockquote>\n
        ==<\/p>\n
        \uff01=<\/p>\n
        <=<\/p>\n
        \n
        =<\/p>\n<\/blockquote>\n
        === \u5168\u7b49\u4e8e\uff1a\u5c06\u6570\u503c\u4ee5\u53ca\u6570\u636e\u7c7b\u578b\u4e00\u5e76\u6bd4\u8f83<\/p>\n
        \uff01==\u4e0d\u5168\u7b49\u4e8e\uff1a\u5c06\u6570\u503c\u4ee5\u53ca\u6570\u636e\u7c7b\u578b\u4e00\u5e76\u6bd4\u8f83<\/p>\n
        \u8d4b\u503c\u8fd0\u7b97\u7b26<\/h2>\n
        =<\/p>\n
        +=<\/p>\n
        -=<\/p>\n
        *=<\/p>\n
        \/=<\/p>\n
        %=<\/p>\n
        a=a+2;==>a+=2<\/p>\n
        a=a-2;==>a-=2<\/p>\n
        a=a2;==>a<\/em>=2<\/p>\n
        a=a\/2;==>a\/=2<\/p>\n
        a=a%2;==>a%=2<\/p>\n
        \u903b\u8f91\u8fd0\u7b97\u7b26<\/h2>\n
        && \u5168\u771f\u4e3a\u771f<\/p>\n
        || \u4e00\u4e2a\u4e3a\u771f\u5c31\u662f\u771f<\/p>\n
        \uff01 \u53d6\u53cd<\/p>\n
        \u4e09\u5143\u8fd0\u7b97\u7b26<\/h2>\n
        \u8868\u8fbe\u5f0f 1?\u8868\u8fbe\u5f0f 2:\u8868\u8fbe\u5f0f 3<\/p>\n
        \u5f53\u6211\u7684\u8868\u8fbe\u5f0f 1 \u6210\u7acb\u65f6 \u6267\u884c\u8868\u8fbe\u5f0f 2 \u5426\u5219\u6267\u884c\u8868\u8fbe\u5f0f 3<\/p>\n
        var max = 2>1?'>':'<';\nconsole.log(max);<\/code><\/pre>\n
        \u6d41\u7a0b\u63a7\u5236\u8bed\u53e5<\/h1>\n
        if\u8bed\u53e5<\/h2>\n
        if(\u6761\u4ef6){<\/p>\n
        \u51fd\u6570\u4f53<\/p>\n
        }<\/p>\n
        if else\u8bed\u53e5<\/h2>\n
        if(\u6761\u4ef6){<\/p>\n
        \u51fd\u6570\u4f53 1<\/p>\n
        }else{<\/p>\n
        \u51fd\u6570\u4f53 2<\/p>\n
        }<\/p>\n
        if else if else \u8bed\u53e5<\/h2>\n
        if(\u6761\u4ef6 1){<\/p>\n
        }else if(\u6761\u4ef6 2){<\/p>\n
        }else if(\u6761\u4ef6 n){<\/p>\n
        }else{<\/p>\n
        }<\/p>\n
        switch\u8bed\u53e5<\/h2>\n
        switch(\u8868\u8fbe\u5f0f) {<\/p>\n
        case n:<\/p>\n
        \u4ee3\u7801\u5757<\/p>\n
        break;<\/p>\n
        case n:<\/p>\n
        \u4ee3\u7801\u5757<\/p>\n
        break;<\/p>\n
        default:<\/p>\n
        \u9ed8\u8ba4\u4ee3\u7801\u5757<\/p>\n
        }<\/p>\n
        switch (new Date().getDay()) {\ncase 6:\ntext = \"\u4eca\u5929\u662f\u5468\u516d\";\nbreak;\ncase 0:\ntext = \"\u4eca\u5929\u662f\u5468\u65e5\";\nbreak;\ndefault:\ntext = \"\u671f\u5f85\u5468\u672b~\";\n}<\/code><\/pre>\n
        \u5faa\u73af\u7ed3\u6784<\/h1>\n
        while \u5faa\u73af<\/h2>\n
        \u5148\u5224\u65ad\u6761\u4ef6 \u5f53\u6761\u4ef6\u6210\u7acb \u518d\u6267\u884c<\/p>\n
        while(\u5faa\u73af\u6210\u7acb\u6761\u4ef6){<\/p>\n
        ….<\/p>\n
        }<\/p>\n
        do while\u5faa\u73af<\/h2>\n
        do…while \u5faa\u73af:\u4e0d\u8bba\u6761\u4ef6\u6210\u4e0d\u6210\u7acb \u5148\u6267\u884c\u4e00\u904d \u518d\u5224\u65ad<\/p>\n
        do{<\/p>\n
        …..<\/p>\n
        }while(\u5faa\u73af\u6210\u7acb\u6761\u4ef6)<\/p>\n
        for\u5faa\u73af<\/h2>\n
        for in\u5faa\u73af<\/h2>\n
        continue\uff1a<\/p>\n
        \u8df3\u8fc7\u5f53\u524d\u5faa\u73af\uff0c\u76f4\u63a5\u8fdb\u5165\u5faa\u73af\u7684\u4e0b\u4e00\u4e2a\u6b65\u9aa4<\/p>\n
        break:<\/p>\n
        \u7ed3\u675f\u5faa\u73af<\/p>\n
        JS\u64cd\u4f5cDOM<\/h1>\n
        \u4ec0\u4e48\u662fDOM<\/h2>\n
        \u5728JavaScript\u4e2d\uff0cDOM\uff08Document Object Model\uff09\u662fHTML\u548cXML\u6587\u6863\u7684\u7f16\u7a0b\u63a5\u53e3\u3002\u5b83\u5c06\u6574\u4e2a\u9875\u9762\u8868\u793a\u4e3a\u4e00\u4e2a\u6811\u5f62\u7ed3\u6784\uff0c\u5176\u4e2d\u6bcf\u4e2a\u8282\u70b9\u90fd\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u4ee3\u8868\u6587\u6863\u4e2d\u7684\u4e00\u4e2a\u90e8\u5206\uff0c\u5982\u5143\u7d20\u3001\u5c5e\u6027\u6216\u6587\u672c\u7b49\u3002\u4e0b\u9762\u6211\u5c06\u4ee5\u4e00\u4e2a\u7b80\u5355\u7684HTML\u6587\u6863\u4e3a\u4f8b\uff0c\u7ed8\u5236\u5176\u5bf9\u5e94\u7684DOM\u7ed3\u6784\u56fe\uff0c\u5e76\u9644\u4e0a\u8be6\u7ec6\u7684\u6ce8\u91ca\u8bf4\u660e\u3002<\/p>\n
        HTML \u793a\u4f8b<\/h3>\n
        <!DOCTYPE html>\n<html>\n<head>\n    <title>Sample Page<\/title>\n<\/head>\n<body>\n    <h1>Welcome to My Website<\/h1>\n    <p id=\"intro\">This is a simple web page.<\/p>\n    <div class=\"content\">\n        <p>Here is some more information.<\/p>\n        <ul>\n            <li>Item 1<\/li>\n            <li>Item 2<\/li>\n            <li>Item 3<\/li>\n        <\/ul>\n    <\/div>\n<\/body>\n<\/html>\n<\/code><\/pre>\n
        DOM \u7ed3\u6784\u56fe<\/h3>\n
        Document (\u6839\u8282\u70b9)\n\u2502\n\u251c\u2500\u2500 doctype (\u6587\u6863\u7c7b\u578b\u58f0\u660e)\n\u2502\n\u2514\u2500\u2500 html (HTML\u6587\u6863\u7684\u6839\u5143\u7d20)\n    \u251c\u2500\u2500 head\n    \u2502   \u2514\u2500\u2500 title\n    \u2502       \u2514\u2500\u2500 \"Sample Page\" (\u6587\u672c\u8282\u70b9)\n    \u2502\n    \u2514\u2500\u2500 body\n        \u251c\u2500\u2500 h1\n        \u2502   \u2514\u2500\u2500 \"Welcome to My Website\" (\u6587\u672c\u8282\u70b9)\n        \u2502\n        \u251c\u2500\u2500 p (id=\"intro\")\n        \u2502   \u2514\u2500\u2500 \"This is a simple web page.\" (\u6587\u672c\u8282\u70b9)\n        \u2502\n        \u2514\u2500\u2500 div (class=\"content\")\n            \u251c\u2500\u2500 p\n            \u2502   \u2514\u2500\u2500 \"Here is some more information.\" (\u6587\u672c\u8282\u70b9)\n            \u2502\n            \u2514\u2500\u2500 ul\n                \u251c\u2500\u2500 li\n                \u2502   \u2514\u2500\u2500 \"Item 1\" (\u6587\u672c\u8282\u70b9)\n                \u2502\n                \u251c\u2500\u2500 li\n                \u2502   \u2514\u2500\u2500 \"Item 2\" (\u6587\u672c\u8282\u70b9)\n                \u2502\n                \u2514\u2500\u2500 li\n                    \u2514\u2500\u2500 \"Item 3\" (\u6587\u672c\u8282\u70b9)<\/code><\/pre>\n
        \u6ce8\u91ca\u89e3\u91ca<\/h3>\n