var rega=new RegExp("           ","g"); //创建正则RegExp对象

ntrstr=ntrstr.replace(rega,"");

var regb=new RegExp("       ","g"); //创建正则RegExp对象

ntrstr=ntrstr.replace(regb,"");

var regc=new RegExp(" ","g"); //创建正则RegExp对象

ntrstr=ntrstr.replace(regc,"");