JS 字符串固定位置插入字符

为字符串插入字符 其中soure为原字符串,start为将要插入字符的位置，newStr为要插入的字符

function insertStr(soure, start, newStr){
   return soure.slice(0, start) + newStr + soure.slice(start);
}

示例

var occurTime = 201806042313; //原字符串
var _NewOccurTime = insertStr(insertStr(insertStr(insertStr(insertStr(occurTime,4,"/"),7,"/"),10,"  "),14,":"),17,":00");
alert(_NewOccurTime ); //2018/06/04 23:13:00
function insertStr(soure, start, newStr){   
   return soure.slice(0, start) + newStr + soure.slice(start);
}