How to use 'pop js' in JavaScript

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function popWin(url, name)
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{
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   window.open(url, name ,'scrollbars=yes,resizable=yes,menubar=0,status=no,width=525,height=450,top=100,left=200');
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}

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function pop(){
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    var area=document.getElementById('area');
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    if(area.childElementCount>0){
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        var val=document.getElementsByTagName('input')[0].value;
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        if(area.childElementCount>0){
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            area.removeChild(area.lastElementChild);
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        }else{
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            alert("没的删了")
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        }
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    }else{
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        alert("请输入值");
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    }
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}