代码：
<html>
<body>
<input id="auto_split" />
</body>
<script>
document.querySelector('#auto_split').addEventListener('blur', function() {
var val = this.value,
splitBit = 2; // 分割的位数
if(val) {
var fmtVal = val.replaceAll(' ','').split('').reduce(function(n, m){
if(n.length%(splitBit+1) == splitBit) n = n + ' ';
return n + m;
})
this.value = fmtVal;
}
});
</script>
</html>
效果：
标签：function,字符,分割,val,splitBit,个数,fmtVal,split,var From： https://www.cnblogs.com/xtreme/p/17770371.html