<!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>
<style>
.show{
width: 100px;
height: 100px;
border: 1px solid green;
display: block;
}
</style>
</head>
<body>
<input id="ipt" type="text">
<div></div>
</body>
<script>
var ipt = document.querySelector('#ipt');
var divs = document.querySelector('div')
var debounce = function(fn,interval){
var _self = fn,
timer = null
return function(){
var _me = this,
args = arguments;
if(timer){
clearTimeout(timer)
}
timer = setTimeout(function(){
_self.apply(_me,args)
},interval || 500)
}
}
ipt.addEventListener('input',debounce(function(e){
console.log(e.target.value)
divs.innerHTML = e.target.value
},500))
ipt.addEventListener('focus',function(){
divs.classList.add('show')
})
ipt.addEventListener('blur',function(){
divs.classList.remove('show')
})
</script>
</html>
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