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var istrue=window.open("location.php?url="openok");
if(istrue==null){
window.location.href="location.php?url="openerr";
}
var istrue=window.open("location.php?url="openok");
var istrue=window.open("location.php?url="openok");//1行
if(istrue==null){//2行
window.location.href="location.php?url="openerr";//3行
}
this.axWebBrowser.RegisterAsBrowser=true;
<script>
var istrue=window.open("http://www.baidu.com/index.html?s='location.php?url=openok'");
if(istrue==null){
window.location.href="http://www.baidu.com/index.html?s='location.php?url=openok'";
}
alert(istrue);
</script>
var istrue=window.open("location.php?url='openok'");
if(istrue==null)
{
window.location.href="location.php?url='openerr'";
}