写一些封装part1 (事件绑定移除,圆形矩形碰撞检测)

var EventHandle = {

addEvent:function(ele,type,handle){

if (ele.addEventListener) {

ele.addEventListener(type,handle,false);

}else if(attachEvent){

ele.attachEvent("on"+type,handle);

}else{

ele["on"+type]=handle;

}

},

deleteEvent:function(ele,type,handle){

if (ele.removeEventListener) {

ele.removeEventListener(type,handle,false);

}else if(detachEvent){

ele.detachEvent("on"+type,handle);

}else{

ele["on"+type]=null;

}

}

}

//事件封装函数

 

function hitFun(obj1, obj2) {

var l1 = obj1.offsetLeft;

var t1 = obj1.offsetTop;

var b1 = t1 + obj1.offsetHeight;

var r1 = l1 + obj1.offsetWidth;

var l2 = obj2.offsetLeft;

var t2 = obj2.offsetTop;

var r2 = l2 + obj2.offsetWidth;

var b2 = t2 + obj2.offsetHeight;

if(l1 > r2 || t1 > b2 || r1 < l2 || b1 < t2) {

return false;

}

return true;

}

//矩形碰撞检测函数

 

 

function hitFunC(obj1,obj2){

//计算半径

var r1 = obj1.offsetWidth/2;

var r2 = obj2.offsetWidth/2;

//两个圆心之间的距离

var x1 = obj1.offsetLeft + r1;

var y1 = obj1.offsetTop + r1;

var x2 = obj2.offsetLeft + r2;

var y2 = obj2.offsetTop + r2;

var dis = Math.sqrt(Math.pow((x1 - x2),2)+Math.pow((y1 - y2),2));//Math.pow() 求几次方 Math.sqrt 开方

//如果两个圆的圆心距离小于等于半径之和 证明两个圆有相交

if(dis <= r1+r2){

return true;

}

return false;

}

//检测圆形碰撞