<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<style>
*{
margin: 0;
padding: 0;
list-style: none;
}
ul>li{
line-height: 2;
text-align: center;
}
.add{
color:red;
}
input{
width: 300px;
height: 20px;
border: solid 1px #ccc;
}
</style>
</head>
<body>
<input id="iptvalue" type="text" placeholder="333">
<ul class="uls">
<li>1元</li>
<li>2元</li>
<li>3元</li>
<li>4元</li>
<li>请输入金额</li>
</ul>
<script>
$('.uls li').click(function(event){
for(var i=0;i<$('.uls li').length;i++){
if(i != $(this).index()){
$('.uls li')[i].className = ''
}else if(event.target.innerHTML == '请输入金额'){
alert('获取金额')
}else{
$('.uls li')[i].className = 'add'
var num = event.target.innerHTML.substring(0,event.target.innerHTML.length-1)
$('#iptvalue').val(Number(num).toFixed(2))
}
}
})
</script>
</body>
</html>
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