原生js实现碰撞检测
本文实例为大家分享了js实现碰撞检测的具体代码，供大家参考，具体内容如下
随手写了个简单的碰撞检测的代码。检测box1和box2是否发生碰撞，若发生碰撞，box2颜色发生随机改变，并反弹到随机位置。
<!DOCTYPE html><html lang='en'><head> <meta charset='UTF-8'> <title>Title</title> <style> .box1,.box2{ width: 100px; height: 100px; background-color: #f00; position:absolute; } .box2{ background-color: #00f; left: 200px; top: 200px; } </style></head><body> <div class='box1'></div> <div class='box2'></div></body><script> var box1=document.querySelector('.box1'); var box2=document.querySelector('.box2'); box1.addEventListener('mousedown',mouseHandler); function mouseHandler(e){ if(e.type==='mousedown'){ e.preventDefault(); document.elem=this; document.pointX= e.offsetX; document.pointY= e.offsetY; document.addEventListener('mousemove',mouseHandler); this.addEventListener('mouseup',mouseHandler); }else if(e.type==='mousemove'){ this.elem.style.left= e.x-this.pointX+'px'; this.elem.style.top= e.y-this.pointY+'px'; hitText(this.elem,box2); }else if(e.type==='mouseup'){ document.removeEventListener('mousemove',mouseHandler); this.removeEventListener('mouseup',mouseHandler); } } function hitText(elem1,elem2){ var rect1=elem1.getBoundingClientRect(); var rect2=elem2.getBoundingClientRect(); var ponit1={x:rect1.x,y:rect1.y}; var ponit4={x:rect1.x+rect1.width,y:rect1.y+rect1.height}; if( ponit4.x>rect2.x&&ponit1.x<(rect2.x+rect2.width)&&ponit4.y>rect2.y&&ponit1.y<(rect2.y+rect2.height)){ elem2.style.backgroundColor=randomColor(); elem2.style.left=Math.round(Math.random()*document.documentElement.clientWidth)+'px'; elem2.style.top=Math.round(Math.random()*document.documentElement.clientHeight)+'px'; } } function randomColor(){ var a=Math.round(Math.random()*255); var b=Math.round(Math.random()*255); var c=Math.round(Math.random()*255); var color='rgb('+ a+','+b+','+c+')'; return color; }</script></html>
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