html-jquery/js引用外部图片时遇到看不了或出现403情况解决方法

<script type="text/javascript">
function showImg(url) {
var frameid = 'frameimg' + Math.random();
window.img = '<img id="img" style="width: 100%;height: auto" src=\'' + url + '?' + Math.random() + '\' /><script>window.onload = function() { parent.document.getElementById(\'' + frameid + '\').height = document.getElementById(\'img\').height+\'px\'; }<' + '/script>';
document.write('<iframe id="' + frameid + '" src="javascript:parent.img;" frameBorder="0" scrolling="no" width="100%"></iframe>');
}
</script>

<div>
<script type="text/javascript">showImg("图片url");</script>
</div>

本人已经测试通过了