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javascript简单事件处理和with用法介绍

2013-09-16 00:00 579 查看

这一期介绍一些简单的事件处理：
1.鼠标点击

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 
<html> 
<head> 
<title> New Document </title> 
<meta name="Generator" content="EditPlus"> 
<meta name="Author" content=""> 
<meta name="Keywords" content=""> 
<meta name="Description" content=""> 

<script type="text/javascript"> 
function click1(obj) 
{ 
alert(obj.innerHTML); 
} 
</script> 
</head> 

<body> 
<div onclick="click1(this)" style="cursor:pointer">点击我吧</div> 
</body> 
</html>

this即div的上下文，点击后会弹出<div>之间的内容。
2.鼠标移动

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 
<html> 
<head> 
<title> New Document </title> 
<meta name="Generator" content="EditPlus"> 
<meta name="Author" content=""> 
<meta name="Keywords" content=""> 
<meta name="Description" content=""> 

<script type="text/javascript"> 
function mouse1(obj) 
{ 
obj.style.color = "#f00"; 
obj.style.fontSize = "18px" 
} 
function mouse2(obj) 
{ 
obj.style.color = "#000"; 
obj.style.fontSize = "16px" 
} 
</script> 
</head> 

<body> 
<div onmouseover="mouse1(this)" onmouseout="mouse2(this)">移动到这儿</div> 
</body> 
</html>

onmouseover鼠标放到那儿时，会把字体变大，字体成为红色，离开时字体和颜色恢复。
3.with用法

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 
<html> 
<head> 
<title> New Document </title> 
<meta name="Generator" content="EditPlus"> 
<meta name="Author" content=""> 
<meta name="Keywords" content=""> 
<meta name="Description" content=""> 

<script type="text/javascript"> 
with(document) 
{ 
write("niujiabin"+"<br/>"); 
write("maybe"+"<br/>"); 
write("gossip"+"<br/>"); 
} 
</script> 
</head> 
<body> 
</body> 
</html>

效果与如下相同

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 
<html> 
<head> 
<title> New Document </title> 
<meta name="Generator" content="EditPlus"> 
<meta name="Author" content=""> 
<meta name="Keywords" content=""> 
<meta name="Description" content=""> 

<script type="text/javascript"> 
document.write("niujiabin"+"<br/>"); 
document.write("maybe"+"<br/>"); 
document.write("gossip"+"<br/>"); 
</script> 
</head> 
<body> 
</body> 
</html>

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