function createBrick(n){
var oBrick = document.getElementById("brick")
//在大盒子brick中插入n个div方块,并给予随机颜色
for(var i = 0; i
碰撞检测函数
代码分析见上一篇
function knock(node1,node2){
var l1 = node1.offsetLeft;
var r1 = node1.offsetLeft + node1.offsetWidth;
var t1 = node1.offsetTop;
var b1 = node1.offsetTop+node1.offsetHeight;
var l2 = node2.offsetLeft;
var r2 = node2.offsetLeft + node2.offsetWidth;
var t2 = node2.offsetTop;
var b2 = node2.offsetTop+node2.offsetHeight;
if(l2>r1||r2b1||b2