<iframe id="mainFrame" src="http://jsrun.net/rtd/3wyKp" frameborder="0"> </iframe> <script> function iframeSrcChanged( ) { var url=mainFrame.l if (newValue.indexOf('sina') > -1) { console.log('有危险,请马上离开……') ; iframeObj.src = oldValue; //钓鱼地址,恢复原url } else { console.log('安全地址,允许跳转……'); } }</script>