js实现方块上下左右移动效果
程序员文章站
2022-04-29 08:00:44
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
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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。