jQ 小球碰撞检测

时间：2021-05-06 00:45:03
<!doctype html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>碰撞检测</title>
        <script src="../js/jquery-1.11.0.min.js" type="text/javascript" charset="utf-8"></script>
        <style type="text/css">
            * {
                margin: 0;
                padding: 0;
            }

            .wp {
                width: 600px;
                height: 500px;
                border: 1px solid;
                position: relative;
            }

            .box {
                width: 30px;
                height: 30px;
                background: red;
                position: absolute;
                border-radius: 50%;
            }

            .box2 {
                width: 100px;
                height: 100px;
                background: orange;
                position: absolute;
                top: 0;
                right: 0;
                bottom: 0;
                left: 0;
                margin: auto;
            }
        </style>

    </head>

    <body>
        <div class="wp">
            <div class="box"></div>
            <div class="box2"></div>
        </div>
    </body>
    <script type="text/javascript">
        var wp = $(".wp");
        var box = $(".box");
        var box2 = $(".box2")

        var bl = box.offset().left;
        var bt = box.offset().top;
        var bv = 1;
        var bv2 = 1;
        //随机数
        function randomNum(min,max){
            var choices = max - min + 1;
            var num = Math.floor(Math.random() * choices + min );
            return num;
        }
        //随机颜色
        function colorFun(num){
            if(num==1){
                wp.css('border',"1px solid rgb("+randomNum(0,255)+","+randomNum(0,255)+","+randomNum(0,255)+")");
            }else{
                box2.css('background',"rgb("+randomNum(0,255)+","+randomNum(0,255)+","+randomNum(0,255)+")");
            }
            box.css('background',"rgb("+randomNum(0,255)+","+randomNum(0,255)+","+randomNum(0,255)+")");
        }
        setInterval(function() {
            bl += bv;
            bt += bv2;

            if(bl == (wp.width() - box.width()) || bl <= 0) {
                bv *= -1;
                colorFun(1);
            }
            if(bt >= (wp.height() - box.height()) || bt <= 0) {
                bv2 *= -1;
                colorFun(1);
            }

            // 左侧
            if(bl == (box2.offset().left - box.width()) && bt >= (box2.offset().top-box.height()) && bt <= (box2.offset().top + box2.height())) {
                bv *= -1;
                colorFun();
            }
            // 上侧

            if(bt == (box2.offset().top - box.height()) && bl >= (box2.offset().left- box.width()) && bl <= (box2.offset().left + box2.width())) {
                bv2 *= -1;
                colorFun();
            }

            // 右侧
            if(bl == (box2.offset().left + box2.width()) && bt >= (box2.offset().top-box.height()) && bt <= (box2.offset().top + box2.height())) {
                bv *= -1;
                colorFun();
            }
            // 下侧

            if(bt == (box2.offset().top + box2.height()) && bl >= (box2.offset().left- box.width()) && bl <= box2.offset().left + box2.width()) {
                bv2 *= -1;
                colorFun();
            }

            box.css('left',bl + "px");
            box.css("top" , bt + "px");
        }, )
    </script>

</html>

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