时间字符串拼接“-”格式化为 YY-MM-DD 格式

如：202011120923 格式化为 2020-11-12 09:23

方法：

function insertStr(soure, start, newStr){

  return soure.slice(0, start) + newStr + soure.slice(start);

}

调用：

var _NewOccurTime = insertStr(insertStr(insertStr(insertStr(insertStr(time,4,"-"),7,"-"),10," "),14,":"),17,":");