https页面中使用iframe出现安全警告的解决方法
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该问题的出现通常是iframe中的src属性缺失引起的，解决方法如下：
1.创建一个只含有<html></html>的空白htm页面，把iframe的src属性赋值为该空白页面。
elmIfr = document.createElement("IFRAME"); elmIfr.scr="blank.html";
document.body.appendChild(elmIfr);
2.src = "javascript:void(0)". is working in IE and Firefox
3.In IE6 and Firefox, this could be fixed by src="spacer.gif" and put spacer.gif at your root. Once this image is cached at the browser and browser would not request this image and it should work irrespective of protocol.
4.src = "javascript:''", is working in IE6 SP2
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