ie7 不显示支付宝二维码

[南苑]

http://change.guandan.com/fastpay/fastpay.php?numberid=29019030&username=123&sessionid=C1B27C9EB11340299BA7A0FA416F272B###

在谷歌浏览器上二维码可以正常，但是ie7上不能正常显示，请大神帮忙看看怎么回事呢，在网上是ie不支持trim，但是重写还是没用。

 String.prototype.trim = function () {
             return this .replace(/^\s*((?:[\S\s]*\S)?)\s*$/, '$1' );
         }
         //获取后台数据函数ajax
         function getAjax(i, t, c, w) {
             var url = null;
             if(w == "ali"){
                 url ="alipayphp/example/index.php";
             }else if (w == "wx"){
                 url = "WxpayAPI/example/native.php";
             }
             $.ajax({
                 url: url,
                 type: "POST",
                 data: {
                     userid: i,
                     type: 'vip',
                     cash: c,
                     ways: w
                 },
                 success: function (ret) {
                     if(w == "ali"){
                         var qr = $("#alipay_er");
                         qr.attr("src", ret.trim());
                         qr.show();
                     }else if(w == "wx"){
                         var result = $.parseJSON(ret);
                         orderNu = result.out_trade_no;
                         $(".scan img").attr("src",result.img);
                         start = self.setInterval(checkstatus(orderNu), 10000);
                     }
                 }

             })
         }

[傲雪星枫]

String.prototype.trim = function () { return this .replace(/^\s*((?:[\S\s]*\S)?)\s*$/, '$1' ); } 这段不要 qr.attr("src", ret.trim()) 改为 qr.attr("src", $.trim(ret));

<script type="text/javascript">
  $(function(){
    var qr = $('#alipay_er');
    var str = 'http://img1.tbcdn.cn/tfscom/TB1lVPsOVXXXXXzXVXXXXXXXXXX';
    qr.attr('src', $.trim(str));
    qr.show();
  })
</script>
<img id="alipay_er" style="display:none">