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js实现方块上下左右移动效果
本文实例为大家分享了js实现方块移动的具体代码，供大家参考，具体内容如下
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
#box{
width: 50px;
height: 50px;
position: absolute;
background: palevioletred;
}
</style>
</head>
<body>
<div id="box" style = "left: 0; top: 50px;"></div>
<button id = "btn">stop</button>
</body>
<script type="text/javascript">
var speed = 10;
var flag = true;
var interId;
function moveLeft(){
var oldLeft = parseInt(box.style.left);
if(oldLeft >= window.innerWidth-50 || oldLeft < 0){
speed *= -1;
}
box.style.left = oldLeft + speed + "px";
}
function moveTop(){
var oldTop = parseInt(box.style.top);
if(oldTop >= window.innerHeight-50 || oldTop < 0){
speed *= -1;
}
box.style.top = oldTop + speed + "px";
}
function onOff(rand){
// var rand = random();
if (flag) {
btn.innerHTML = "start";
clearInterval(interId);
flag = false;
} else{
btn.innerHTML = "stop";
if (rand == 1) {
interId = setInterval("moveLeft()",50);
// flag = true;
} else{
interId = setInterval("moveTop()",50);
// flag = true;
}
flag = true;
}
}
btn.onclick =onOff;
//产生一个1-2的随机数
function random(){
rand = parseInt(Math.random() * 2 + 1);
alert(rand);
if (rand == 1) {
interId = setInterval("moveLeft()",50);
} else{
interId = setInterval("moveTop()",50);
}
}
random();
</script>
</html>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持码农之家。
