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);

}

 

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