js获取屏幕大小

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    <html>  
    <script>  
    function a(){  
    document.write(  
    "屏幕分辨率为:"+screen.width+"*"+screen.height  
    +"<br />"+  
    "屏幕可用大小:"+screen.availWidth+"*"+screen.availHeight  
    +"<br />"+  
    "网页可见区域宽:"+document.body.clientWidth  
    +"<br />"+  
    "网页可见区域高:"+document.body.clientHeight  
    +"<br />"+  
    "网页可见区域宽(包括边线的宽):"+document.body.offsetWidth   
    +"<br />"+  
    "网页可见区域高(包括边线的宽):"+document.body.offsetHeight   
    +"<br />"+  
    "网页正文全文宽:"+document.body.scrollWidth  
    +"<br />"+  
    "网页正文全文高:"+document.body.scrollHeight  
    +"<br />"+  
    "网页被卷去的高:"+document.body.scrollTop  
    +"<br />"+  
    "网页被卷去的左:"+document.body.scrollLeft  
    +"<br />"+  
    "网页正文部分上:"+window.screenTop  
    +"<br />"+  
    "网页正文部分左:"+window.screenLeft  
    +"<br />"+  
    "屏幕分辨率的高:"+window.screen.height  
    +"<br />"+  
    "屏幕分辨率的宽:"+window.screen.width  
    +"<br />"+  
    "屏幕可用工作区高度:"+window.screen.availHeight  
    +"<br />"+  
    "屏幕可用工作区宽度:"+window.screen.availWidth  
    );  
    }  
    </script>  
    <body onload="a()" >  
    </body>  
    </html>