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Obtain CLASS object using native JS (very simple and practical)_javascript skills

WBOY
WBOYOriginal
2016-05-16 16:33:522205browse

I heard it is the most commonly used. . . . I came up with this idea after watching The Art of DOM Programming. 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 

<html xmlns="http://www.w3.org/1999/xhtml"> 

<head> 

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 

<title>无标题文档</title> 

<style> 

.ca{background-color:red; padding:20px;} 

.js{ border:1px solid #00F; padding:10px;} 

</style> 

</head> 


<body> 

<div class="ca"> 

sss 

</div> 

<div class="js" id="as"> 

</div> 

<div class="bd"> 

</div> 

<div class="ca"> 

</div> 

</body> 

</html> 

<script> 

function getElementsClass(classnames){ 
var classobj= new Array();//定义数组 

var classint=0;//定义数组的下标 

var tags=document.getElementsByTagName("*");//获取HTML的所有标签 

for(var i in tags){//对标签进行遍历 

if(tags[i].nodeType==1){//判断节点类型 

if(tags[i].getAttribute("class") == classnames)//判断和需要CLASS名字相同的，并组成一个数组 

{ 

classobj[classint]=tags[i]; 

classint++; 

} 

} 

} 

return classobj;//返回组成的数组 

} 


//以下就是测试了 

var a=getElementsClass("ca"); 

a[0].onclick=function(){alert("我们来了");} 

a[1].innerHTML='我们来了'; 

</script>

Sometimes there are multiple doms with the same class, which can be handled like this:

Copy code The code is as follows:

var a=getElementsClass("ca");
for(var i=0;i (function(i){
alert(a[i])
})(i)
}

If there are multiple identical classes, they can be used together. If you want to reach JQ, where can you click directly? You also need to do some more complicated processing
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