随机运动图像不会移动

时间:2015-07-06 13:55:34

标签: javascript html css

我有脚本,但它似乎不起作用。我没有错误消息,但图像只是坐在那里什么都不做。我完全不知道问题出在哪里,我们将非常感谢任何帮助。

HTML:

<!DOCTYPE html>
<html>
<head>
    <link rel='stylesheet' href='style.css'/>
    <script src='script.js'></script>
</head>
<body>
<div class='a'></div>


</body>
</html>

CSS:

 div.a {
    width: 50px;
    height:50px;
    background-color:red;
    position:fixed;
}

的JavaScript

  $(document).ready(function () {
    animateDiv();

});

function makeNewPosition() {


    var h = $(window).height() - 50;
    var w = $(window).width() - 50;

    var nh = Math.floor(Math.random() * h);
    var nw = Math.floor(Math.random() * w);

    return [nh, nw];

}

function animateDiv() {
    var newq = makeNewPosition();
    var oldq = $('.a').offset();
    var speed = calcSpeed([oldq.top, oldq.left], newq);

    $('.a').animate({
        top: newq[0],
        left: newq[1]
    }, speed, function () {
        animateDiv();
    });

};

function calcSpeed(prev, next) {

    var x = Math.abs(prev[1] - next[1]);
    var y = Math.abs(prev[0] - next[0]);

    var greatest = x > y ? x : y;

    var speedModifier = 0.1;

    var speed = Math.ceil(greatest / speedModifier);

    return speed;

}

1 个答案:

答案 0 :(得分:0)

你应该从这里链接到jquery库:https://jquery.com/只需下载库并在html中引用它

这是您将文件添加到页面的方式:

<!DOCTYPE html>
<html>
<script type="text/javascript" src="jquery-1.6.2.min.js"></script>
<head>
   <link rel='stylesheet' href='style.css'/>
   <script src='script.js'></script>
</head>
<body>
<div class='a'></div>


</body>
</html>