扫码页获取二维码的code

function getUrlParms(name){
    var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)");
    var r = window.location.search.substr(1).match(reg);
    if(r!=null)
    return unescape(r[2]);
    return null;
}
this.scode = getUrlParms("code");