JS相容方式擷取瀏覽器的寬度

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<script type="text/javascript">                //need to wait until onload so body is available            window.onload = function(){                    function getWindowWidth(){                if (window.innerWidth){                    return window.innerWidth;                } else if (document.documentElement.clientWidth){                    return document.documentElement.clientWidth;                } else if (document.body.clientWidth){                    return document.body.clientWidth;                }            }                                            //determine if the browser has Netscape-style plugins            var hasNSPlugins = !!(navigator.plugins && navigator.plugins.length);                        //determine if the browser has basic DOM Level 1 capabilities            var hasDOM1 = !!(document.getElementById && document.createElement &&                            document.getElementsByTagName);                        alert("Window width: " + getWindowWidth());            alert("Supports Netscape plugins? " + hasNSPlugins);            alert("Supports Core DOM 1? " + hasDOM1);        }    </script>