?????? ???
JavaScript ???
??? ?? ?? JavaScript ????? ???? ?? ?????.
??? ?? ??? ?? ??? ?? ? ????. ??? ??? ??? ??? ??? ??? ?????.
?? ??????? ??? ??? ???? ???? ??? ?? ?? ??? ??? ??? ?? ? ????.
JavaScript ??? ??
???? ???? ??? ?? ?? ?? ?????? ???.
???? ???? ???? ?? ?????? ??? ??? ???? ????.
??? ??? ??? ????? ??? ? ??? ??? ?? ???? ????? ?????.
??? ??? ???? ???(?? ??? ???? ??)? ???? ??? ???? ?? ??? ??? ? ????.
?????? ??? ??? ?????? ????? F12 ?? ??? ??? ???? "??"? ?????.
JavaScript ????? ?????? console.log()? ???? ?? Alert()?? ? ?? ?????. ? ??? ??? ????. Alert() ??? JavaScript ????? ??? ???? console.log? ??????. ()? ??? ?? ??? ????? ??? ??? ???? ????
console.log()? ??????
?? ??? ?? ????? ???? ??? ???? ?????? ??? ??? ???? ?? ???? ????? ???? ??? ? ????. ?? ??, ?? ??? Firefox?? ??? ??? ??? ????. ? ?? Firebug ????? ???? ??? ??? ??? ? ????. ??? ??? ?? ??????? console??? ?? ??? ??? ??? ??? ???? window ??? ?????. ?? ??? log() ??? ???? ??? ??? ??? ? ????. ?? ?? ?? ??? ??? "?? ??"? ?????.
??? ??? ????. window.console.log("Sample log")
? ??? ? ??? ????
??? ??? ????:console.log("Sample log");
console.log()? ?? ???, ?? ? JavaScript ??? ??? ? ????. Alert() ??? ???? console.log()? ?? ?? n? ? ?? t? ??? ? ????. console.log() ?? ?? ??? ??? ??? ????? ??? ???? ? ? ????. console.log()? ??? ?????? ?? ? ????.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php中文網(wǎng)(php.cn)</title>
<script type="text/javascript">
//變量
var i = 'I am a string';
console.log('變量：',i);
//數(shù)組
var arr = [1,2,3,4,5];
console.log('數(shù)組：',arr);
//對象
var obj1 = {
key1 : 'value1',
key2 : 'value2',
key3 : 'value3'
};
var obj2 = {
key6 : 'value4',
key5 : 'value5',
key4 : 'value6'
};
var obj3 = {
key9 : 'value7',
key8 : 'value8',
key7 : 'value9'
};
console.log('對象：',obj1);
//對象數(shù)組
var objArr1 = [obj1,obj2,obj3];
var objArr2 = [[obj1],[obj2],[obj3]];
console.log('對象數(shù)組1：',objArr1);
console.log('對象數(shù)組1：',objArr2);
</script>
</head>
<body>
<p>
瀏覽器中(Chrome, IE, Firefox) 使用 F12 來啟用調(diào)試模式， 在調(diào)試窗口中點擊 "Console" 菜單。
</p>
</body>
</html>debugger ???
debugger ???? JavaScript ??? ???? ??? ??? ???? ? ?????.
? ???? ??? ???? ???? ???? ?? ??? ??? ????.
???? ??? ? ??? ??? ?? ???? ????.
???? ????? ? ?? ? ??? ?? ??? ?????.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php中文網(wǎng)(php.cn)</title>
</head>
<head>
</head>
<body>
<p id="demo"></p>
<script>
var x = 5 * 5 + 5;
debugger;
document.getElementById("demo").innerHTML = x;
</script>
</body>
</html>?? ????? ??? ??
????? ?????? ??? ??? ?????? F12 ?? ??? ??? ???? "??"? ?????.
? ????? ??? ??? ????.
Chrome ????
????? ???. ???? ??? ?????. ???? ??? ??? ?????. ????? ??? ?????.
Firefox ????
????? ???. ??? ??:
http://www.getfirebug.com. ??? ????:
Firebug? ?????.
Internet Explorer ????.
????? ???. ???? ??? ?????. ???? ??? ??? ?????. ????? ??? ?????.
Opera
????? ???. Opera? ??? ??? ??? Dragonfly???. ??? ??? ???
http://www.opera.com/dragonfly/ ???? ?????.
Safari
????? ???. ??? ??? ??? ???? ?? ??? ?????. ??? ???? ??? "??"? ?????.
