input输入框4位一个空格，模拟银行卡号输入
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>银行卡四位空格</title>
<script src="http://libs.baidu.com/jquery/1.11.3/jquery.mi...
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>银行卡四位空格</title>
<script src="http://libs.baidu.com/jquery/1.11.3/jquery.min.js"></script>
<style>
</style>
</head>
<body>
<input type="text" id="kahao">
<script>
$(function() {
$('#kahao').on('keyup', function(e) {
//只对输入数字时进行处理
if ((e.which >= 48 && e.which <= 57) ||
(e.which >= 96 && e.which <= 105)) {
//获取当前光标的位置
var caret = this.selectionStart
//获取当前的value
var value = this.value
//从左边沿到坐标之间的空格数
var sp = (value.slice(0, caret).match(/\s/g) || []).length
//去掉所有空格
var nospace = value.replace(/\s/g, '')
//重新插入空格
var curVal = this.value = nospace.replace(/(\d{4})/g, "$1 ").trim()
//从左边沿到原坐标之间的空格数
var curSp = (curVal.slice(0, caret).match(/\s/g) || []).length
//修正光标位置
this.selectionEnd = this.selectionStart = caret + curSp - sp
}
})
})
</script>
</body>
</html>
- 发表于 2020-06-27 12:15
- 阅读 ( 554 )
- 分类：web前端开发
