获取窗口大小

var pageWidth = window.innerWidth;
var pageHeight = window.innerHeight;
if(typeof pageWidth != "number") {
if(document.compatMode == "CSS1Compat") {
pageWidth = document.documentElement.clientWidth;
pageHeight = document.documentElement.clientHeight;
} else {
pageWidth = document.body.clientWidth;
pageHeight = document.body.clientHeight;
}
}

获取窗口大小

原文：https://www.cnblogs.com/TNTS/p/10113622.html