输入的过程中直接将中间4位实时转成星号，代码如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<div id="app">
<input @input="inpute($event)" v-model="val" />
</div>
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/vue.2.2.min.js"></script>
<script>
new Vue({
el: '#app',
data: function() {
return {
val:"",
}
},
methods:{
inpute:function(e){
console.log(e.data)
let str="";
for(i=0;i<this.val.length;i++){
if(i>2&&i<7){
str+="*";
}else{
str+=this.val[i];
}
}
this.val=str;
this.score++;
},
},
})
</script>
</body>
</html>
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