JS implementation of the static element automatically moving example

2020-03-30 02:38:40
OfStack

An element is static, allowing it to move automatically on the screen.

This is a relatively simple problem, encountered in the learning, write it down.

 
<!DOCTYPE html> 
<html> 
<head> 
<title></title> 
<meta http-equiv="content-type" content="text/html; charset=utf-8" /> 
<style> 
#sp1{ 
border: red solid ; 
display: inline-block; 
width: 30px; 
height: 20px; 
font-size: 20px; 
text-align: center; 
} 
</style> 
<script> 
var timenum; 
var mar=0;//A variable that controls the amount of movement
var flag = 0;//Implement a variable that controls left and right movement
//Implement a function that moves to the right
function moveright(){ 
sp1.style.marginLeft=mar+"px"; 
mar=mar+5; 
} 
//Implement a function that moves to the right
function moveleft(){ 
sp1.style.marginLeft=mar+"px"; 
mar=mar-5; 
} 

function go() { 
var sp1 =document.getElementById("sp1"); 
var btn1 = document.getElementById("start"); 
if(!btn1.disabled){ 
btn1.disabled = true; 
document.getElementById("pause").disabled=false; 
} 
sp1.innerHTML=parseInt(sp1.innerHTML)+1; 
timenum = window.setTimeout(go,10); 
if(flag==1){ 
window.setTimeout(moveleft,10); 
} 
if(flag==0){ 
window.setTimeout(moveright,10); 
} 
if(mar>(window.outerWidth)){ 
flag=1; 
} 
if(mar<0){ 
flag=0; 
} 
} 
function stop(){ 
document.getElementById("start").disabled = false; 
document.getElementById("pause").disabled=true; 
window.clearTimeout(timenum); 
} 
</script> 
</head> 
<body> 
<button id="start" <button id="pause" disabled> suspended </button> 
<br/> 
<span id="sp1">0</span> 
</body> 
</html>