1 window.onload = function() { 2     alert("width: " + getPageScale().pageWidth + ", height: " + getPageScale().pageHeight); 3 }; 4  5 /** 6  * 获取浏览器视口大小 7  * @return {object} 宽，高 8  */ 9 function getPageScale(){10     var pageWidth = window.innerWidth,11         pageHeight = window.innerHeight;12 13     if (typeof pageWidth !== "number") {14         if (document.compatMode === "CSS1Compat") {15             pageWidth = document.documentElement.clientWidth;16             pageHeight = document.documentElement.clientHeight;17         }else{18             pageWidth = document.body.clientWidth;19             pageHeight = document.body.clientHeight;20         }21     }22 23     return {pageWidth, pageHeight};24 }