javascript 获取当前页面可视高度和宽度的函数
function getPageSize(){ var xScroll,yScroll; if (window.innerHeight && window.scrollMaxY){ xScroll = window.innerWidth + window.scrollMaxX; yScroll = window.innerHeight + window.scrollMaxY; } else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac xScroll = document.body.scrollWidth; yScroll = document.body.scrollHeight; }else{// Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari xScroll = document.body.offsetWidth; yScroll = document.body.offsetHeight; } var windowWidth, windowHeight; if (self.innerHeight){ // all except Explorer windowWidth = self.innerWidth; windowHeight = self.innerHeight; } else if (document.documentElement && document.documentElement.clientHeight){ // Explorer 6 Strict Mode windowWidth = document.documentElement.clientWidth; windowHeight = document.documentElement.clientHeight; } else if (document.body){// other Explorers windowWidth = document.body.clientWidth; windowHeight = document.body.clientHeight; } // for small pages with total height less then height of the viewport var pageWidth,pageHeight; if(yScroll < windowHeight){ pageHeight = windowHeight; }else{ pageHeight = yScroll; } if(xScroll < windowWidth){ pageWidth = windowWidth; }else{ pageWidth = xScroll; } return { "pageWidth":pageWidth, "pageHeight":pageHeight } } //alert(getPageSize().pageHeight)
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