不同HTML文档类型测试

function getSize() {
var obj = new Object();
obj.allWidth = document.body.scrollWidth;
obj.allHeight = document.body.scrollHeight;
if (-[1, ]) { //非IE
obj.top = document.body.scrollTop;
obj.left = document.body.scrollLeft;
if (document.compatMode === 'CSS1Compat') {
obj.width = document.documentElement.clientWidth;
obj.height = document.documentElement.clientHeight;
}
else {
obj.width = document.body.clientWidth;
obj.height = document.body.clientHeight;
}
} else {
if (document.compatMode === 'CSS1Compat') {
obj.width = document.documentElement.clientWidth;
obj.height = document.documentElement.clientHeight;
obj.top = document.documentElement.scrollTop;
obj.left = document.documentElement.scrollLeft;
}
else {
obj.width = document.body.clientWidth;
obj.height = document.body.clientHeight;
obj.top = document.body.scrollTop;
obj.left = document.body.scrollLeft;
}
}
alert(obj.top);
alert(obj.left);
alert(obj.width);
alert(obj.height);
return obj;
}