<html>
<head>
<meta charset="utf-8">
<title>JS Bin</title>
</head>
<body>
<ul id="haha">
<li>a</li>
<li>b</li>
<li>c</li>
<li>d</li>
<li>e</li>
</ul>
<input type="text" id="my">
<script>
var a = document.getElementById('haha');
var my=document.getElementById("my");
my.addEventListener("keyup",function(e){
let str=my.value;
let val=this.value;
let d=/\d{5}/g;
this.value=this.value.replace(this.value, function(word){
if(word.indexOf(".")===-1){
return word;
}else{
let arr=word.split(".");
let first=arr[0];
let last=arr[1].substr(0,2);
return first+"."+last;
}
}
);
},false
)
haha.addEventListener('click',function (e){
if(e.target.tagName === 'LI'){
console.log('ok！')
}
})
//注意tagName是大写
</script>
</body>
</html>