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05.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="js/jquery-1.12.4.js"></script>
<script>
// $(function(){
// var inpu = document.getElementsByTagName('input')[0];
// //inpu.value=1000;此时并没有将节点属性上的value改变而使将文本框中的值改变
// $('input').attr('value','1000');此时将节点属性上的value改变
// });
$(function(){
// var btns=$('button');
var btns = document.getElementsByTagName('button');
//console.log(btns.eq(1));//jquery对象
console.log(btns[1]);//html对象 js原生
btns[0].onclick = function(){
$('div').addClass('class1 class2');
};
btns[1].onclick = function(){
$('div').removeClass('class1 class2');
};
btns[2].onclick = function(){
$('div').toggleClass('class1');
};
btns[3].onclick = function(){
$('div').toggleClass('class2');
};
});
</script>
<style type="text/css">
.class1{
background-color: #bfa;
width:100px;
height:100px;
}
.class2{
border:5px solid red;
}
</style>
</head>
<body>
<!--<input type="text" value="100">-->
<button>添加类</button>
<button>删除类</button>
<button>切换类1</button>
<button>切换类2</button>
<div class="box"></div>
</body>
</html>