php 由页面倾斜扩展的页面晃动

var i = 1;
var num = 0.1;
var j = 20;
var nums = -17;
function Jump(){
    if(num>0){
        num = num + (i*0.1);
    }else{
        num = num - (i*0.1);
    }
    num = 0-num;
    var a = document.getElementById("test");
    a.innerHTML ="<style> body{-o-transform: rotate("+num+"deg);-webkit-transform: rotate("+num+"deg);-moz-transform: rotate("+num+"deg);}</style>"
    i++;
    if(i<20){
        document.onload = setTimeout("Jump()",500);
    }else{
        document.onload = setTimeout("Jumps()",500);
    }
}
function Jumps(){
    if(nums>0){
        nums = nums - (j*0.1);
    }else{
        nums = nums + (j*0.1);
    }
    nums = 0-nums;
    var a = document.getElementById("test");
    a.innerHTML ="<style> body{-o-transform: rotate("+nums+"deg);-webkit-transform: rotate("+nums+"deg);-moz-transform: rotate("+nums+"deg);}</style>"
    j--;
    if(j>1){
        document.onload = setTimeout("Jumps()",500);
    }
}
document.onload = setTimeout("Jump()",3000);
//该片段来自于http://outofmemory.cn