javascript 得到当前页面可视高度和宽度
function getHeight(){
var yScroll;
if (window.innerHeight && window.scrollMaxY) {
yScroll = window.innerHeight + window.scrollMaxY;
} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
yScroll = document.body.scrollHeight;
} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
yScroll = document.body.offsetHeight;
}
var windowHeight;
if (self.innerHeight) { // all except Explorer
windowHeight = self.innerHeight;
} else if (document.documentElement && document.documentElement.clientHeight) {
// Explorer 6 Strict Mode
windowHeight = document.documentElement.clientHeight;
} else if (document.body) { // other Explorers
windowHeight = document.body.clientHeight;
}
// for small pages with total height less then height of the viewport
if(yScroll < windowHeight){
pageHeight = windowHeight;
} else {
pageHeight = yScroll;
}
return pageHeight;
}
function getWidth(){
var xScroll
if (window.innerHeight && window.scrollMaxY) {
xScroll = document.body.scrollWidth;
} else if (document.body.scrollHeight > document.body.offsetHeight){ // all b
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