javascript 指定位置插入字符串

function( str)

{

var strFour=str.substring(str.length-4,str.length-3);

var strEight=str.substring(str.length-8,str.length-7);

var warpstrFour="<span class='span1'>"+strFour+"</span>";

var warpstrEight="<span class='span2' >"+streight+"</span>";

return str.replace(warpstrFour,strFour).replace(warpstrEight,strEight);

}

 

出处：https://zhidao.baidu.com/question/2202622402001830188.html