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js中运算符

2024-09-01 02:13:45   218人阅读

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>

<script>
/*
var i = 0;
i++;
if( i === 5 ){
	i = 0;
}
i%=5;

a = a + b;
a += b;

‘200‘==200、!=
‘200‘===200、!==

*/

var s = 3605;			// 秒
alert( Math.floor(s/60) + ‘分‘ + s%60 + ‘秒‘  );

window.onload = function (){
	var aLi = document.getElementsByTagName(‘li‘);
	var arr = [ ‘red‘, ‘yellow‘ ];
	var str = ‘‘;
	
	for( var i=0; i<aLi.length; i++ ){
		
		aLi[i].index = i;
		
		aLi[i].style.background = arr[i%arr.length];
		
		aLi[i].onmouseover = function (){
			str = this.style.background;						// 先存颜色
			this.style.background = ‘gray‘;
		};
		aLi[i].onmouseout = function (){
			// this.style.background = arr[this.index%arr.length];
			this.style.background = str;
		};
	}
};
</script>
<style>
li { height:24px; margin-bottom:3px; list-style:none; }
</style>
</head>

<body>

<ul id="ul1">
	<li></li>
	<li></li>
	<li></li>
	<li></li>
	<li></li>
	<li></li>
	<li></li>
	<li></li>
	<li></li>
	<li></li>
	<li></li>
	<li></li>
	<li></li>
</ul>

</body>
</html>

　　

js中运算符


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