手机号4位显示空格，银行卡每4位显示空格
开发有时候会遇到输入手机号和银行卡号，按照每4位显示一个空格的需求，方便用户阅读，如果是纯展示，就很容易实现，如果是一边输入一边展示则有点难度
有人用两个input实现，一个负责输入数据，但是透明看不见，另外一个展示在界面上，变相的解决了这个需求（手机上可调用数字键盘）
本次取巧写个demo，只用一个input用定时器不断的查询输入的字符来判断输入的数据（无法直接调用数字键盘，因为里边有空格）
如果是银行卡号，将字符判断长度更改为，也可以根据实际需求来判断长度
lastLen === 5 || lastLen === 10 || lastLen === 15|| lastLen === 20
话不多说，上代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no"/>
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="renderer" content="webkit">
<title>Title</title>
</head>
<body>
<input type="text" id="telphone"><span id="err">
<script>
var telphone = document.getElementById('telphone');
var err = document.getElementById('err');
//定义两个缓存值
var firstLen = 0;
var lastLen = 0;
var re=/^1(3|4|5|7|8)\d{9}$/;
telphone.oninput = function () {
telphone.value = telphone.value.substr(0, 13);//只允许输入11位+2个空格
//用户输入满11位开始验证
if(telphone.value.length==13){
//将数据去掉空格后验证
if(!re.test(telphone.value.replace(/\s/g, ''))){
err.innerHTML='手机号码有误'
} else{
err.innerHTML=''
}
}else{
err.innerHTML=''
}
}
telphone.onfocus = function () {
timer = setInterval(function () {
lastLen = telphone.value.length;
if (lastLen > firstLen) {
firstLen = telphone.value.length;
if (lastLen === 4 || lastLen === 9) {
var temp1 = telphone.value.substr(0, telphone.value.length - 1);
var temp2 = telphone.value.substr(telphone.value.length - 1);
telphone.value = temp1 + ' ' + temp2;
}
} else if (lastLen <= firstLen) {
if (lastLen === 4 || lastLen === 9) {
telphone.value = telphone.value.substr(0, telphone.value.length - 1);
}
firstLen = telphone.value.length;
}
}, 10);//如果手机出现卡顿，可适当把定时器时间加大
}
</script>
</body>
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