!function () {
document.getElementById('bankCard').onkeyup = function (event) {
var v = this.value;
if(/\S{5}/.test(v)){
this.value = v.replace(/\s/g, '').replace(/(.{4})/g, $1 );
2、jQuery写法
</t
// 将
<em>
字符串
</em>
的每
<em>
个字符
</em>
都添
<em>
加
</em>
一个0：a --> a0 然后删除最后一个 0
function insert(str) {
for (let i = 0; i < str.length; i += 2) {
str = str.replace(str[i], str[i] + '.
var v = obj.value;
console.info(v);
v =v.replace(/(\s)/g,'').replace(/(\d{4})/g,'$1 ').replace(/\s*$/,'')
obj.value =v;
}原理：首先将现有的输
var num1 = '82452365122547854'
var num2 = num1.replace(/(.{4})/g, "$1 ")
console.log('正常显示：',num1)
console.log('每四位数用
<em>
空格
</em>
隔开：',num2)
控制台输出为：
var getIc = function (ic){
var arric = ic.split(“,”);
randomIc = arric[Math.floor(Math.random()*(arric.length))];
return randomIc
return function (oc,ic,re){
var reStr = “(.{“+re+”}|.*)”;
var reg = new RegExp(reStr,”g”);
var ocArray = oc.match(reg)
var arrLength =
<div class="desc ellipsis-online ellipsis-online-1">
转自：http://www.haorooms.com/post/
<em>
js
</em>
_yinghangkahao
今天来讲讲
<em>
js
</em>
中实现input中输入数字，控制每四位
<em>
加
</em>
一个
<em>
空格
</em>
的方法！这个主要是应用于我们在填写表单的时候，填写银行卡信息，要求我们输入的数字是四位一个
<em>
空格
</em>
！今天主要介绍两种方式来实现这个方法！但是都运用到了键盘码。下面我就列举一下键盘码，以备后面查阅！
键盘各按键对应的数字
key...
</div>
<div class="desc ellipsis-online ellipsis-online-1">
var str = '2016060520103600466';
var str=str.replace(/\s/g,'').replace(/(.{4})/g,"$1 ");
alert(str);
转载于:https://www.cnblogs.com/xiaozhumaopao/p/7651054.html
</div>
var str = "abcdefg";
str = str.replace(/(.{2})/g, "$1,");
console.log(str); // "ab,cd,ef,g"
解释一下：
- `/(.{2})/g`：正则表达式，表示匹配任意两
<em>
个字符
</em>
组成的
<em>
字符串
</em>
，`g`表示全局匹配。
- `"$1,"`：替换
<em>
字符串
</em>
，表示将匹配到的
<em>
字符串
</em>
后面
<em>
加
</em>
上逗号。
- `str.replace`：
<em>
字符串
</em>
的replace方法，将匹配到的
<em>
字符串
</em>
替换成指定的
<em>
字符串
</em>
。
这样就可以实现
<em>
每隔
</em>
两
<em>
个字符
</em>
<em>
加
</em>
一个逗号的效果了。
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