<!DOCTYPE html>
<html>
<head>
<title></title>
<style type="text/css">
.red{
color:red;
}
.org{
color: blue;
}
</style>
</head>
<body>
<div id="demo">
<span>测试112323</span> <!-- 加载过后 带 red -->
<a>343434</a>
<span>1</span> <!-- 加载过后 带 org -->
<span>444</span> <!-- 加载过后 带 red -->
</div>
</body>
<script type="text/javascript">
window.onload = function(){
var form = document.getElementById('demo').getElementsByTagName('span')
console.log(form,'123')
//form.innerHTML = '123';
//form.className ="red";
//form.setAttribute('className','red')
/*方法1*/
for (var i = 0; i < form.length; i++) { //给所有的span的标签添加class
//form[i].className ='red' ;
//if(i = '1' ) //进入死循环
if(i == 1 ){
form[1].className ='org' ;
}else{
form[i].className ='red' ;
}
}
/*方法2*/
var form = document.querySelectorAll('span')
Array.prototype.forEach.call(form, function(item, index){
//[].forEach.call(form, function(item, index){
item.className = index == 0 ? 'red':'org'
})
}</script>
</html>
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