js獲取html中body與div寬高

1. 獲取body的寬高:

寬: document.documentElement.clientWidth
高: document.documentElement.clientHeight
動態設置body: 
$("body").css("height",document.documentElement.clientHeight-10);  

1. 獲取某個div的寬高

var heightNum = document.getElementById("right_div2").offsetHeight;
var widthNum = document.getElementById("right_div2").offsetWidth;

ps: "right_div2"不要寫成"#right_div2"