我有以下动画:
<!DOCTYPE HTML>
<html>
<head>
<style>
.example_path {
position: relative;
overflow: hidden;
width: 530px;
height: 30px;
border: 3px solid #000;
}
.example_path .example_block {
position: absolute;
background-color: blue;
width: 30px;
height: 20px;
padding-top: 10px;
text-align: center;
color: #fff;
font-size: 10px;
white-space: nowrap;
}
</style>
<script>
function move(elem) {
var left = 0
function frame() {
left+=10 // update parameters
elem.style.left = left + 'mm' // show frame
if (left == 10000) // check finish condition
clearInterval(id)
}
var id = setInterval(frame, 1) // draw every 1ms
}
</script>
</head>
<body>
<div onclick="move(this.children[0])" class="example_path">
<div class="example_block"></div>
</div>
</body>
</html>
正如你所看到的，如果蓝色 block 穿过矩形，它就会移出矩形。我如何让蓝色 block 围绕矩形边框来回摆动，并始终保持速度恒定......
(在我的例子中，速度为 10 m/s 又名 10 mm/ms)
最佳答案
您需要将代码更新为:Here is working JSfiddle
function move(elem) {
var left = 0
var fwdMove = true;
function frame() {
if (left < 0) {
fwdMove = true;
} else if (left > 520) {
fwdMove = false;
}
fwdMove?left += 10:left -= 10
elem.style.left = left + 'px' // show frame
}
var id = setInterval(frame, 1) // draw every 1ms
}
关于JavaScript 振荡，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/17252683/