jQuery implements a method to add specific content to a string according to a specified length_jquery

The example in this article describes the jQuery method of adding specific content to a string according to a specified length. Share it with everyone for your reference. The specific analysis is as follows:

In a recent project, mobile phone numbers needed to be separated by identifiers of a certain length to facilitate reading. After searching online for a while, I found that there was no suitable code, so I handwrote a function myself, which can add the specified length to a string. Insert the separator and friends in need can take it.

var split_str=false;
function insert_flg(str,flg,sn){
  str=str.replace(new RegExp(flg,"g"),"");
  var newstr="";
  var tmp;
  var len=str.length;//长度
  var num=len/sn;//分段数
  var start;
  var end;
  //len%sn //能否完整分段 0：是
  for(i=0;i<num;i+=1){
    if (len%sn!=0){//不能完整分段
      start=i*sn-1;
      end=i*sn+(sn-1);
    }else{
      start=i*sn;
      end=(i+1)*sn;
    }
    start=start<0&#63;0:start;
    if (end<=len){
      tmp=str.substring(start,end);
    }
    newstr+=(end>=len)&#63;tmp:tmp+flg;
  }
  split_str=newstr;
  return newstr;
}
$(function(){
  var phone=$("#phone");
  phone.blur(function(){//失去焦点时触发
    var cont=phone.val();
    cont=jQuery.trim(cont);
    var str_p='-';//拆分符号
    var s=4;//每段长度
    if (!cont||split_str==cont) return false;
 //焦点再次离开时检查内容有无变化
    phone.val(insert_flg(cont,str_p,s));
    })
})

I hope this article will be helpful to everyone’s jQuery programming.