Javascript - 调用 clearInterval() 后 setInterval() 仍在运行

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【中文标题】Javascript - 调用 clearInterval() 后 setInterval() 仍在运行【英文标题】:Javascript - setInterval() still running after clearInterval() called 【发布时间】:2016-07-16 15:14:09 【问题描述】:

我正在使用 javascript 制作游戏。我有向左、向右、重力和向下移动的功能。重力功能使玩家的位置在离开平台 (div) 后移至屏幕底部。当您向右移动时调用重力()函数(OnButtonDownr()),它会阻止向上移动。我的意思是,当我向右走下平台然后尝试上去时,它不起作用,但我可以在下平台之前上去。当我尝试向上(但它不起作用)时,它会产生一种奇怪的效果,看起来它的位置被设置为 0,但同时向上移动。我的代码:

HTML (index.htm):

<html>
<head><link rel='stylesheet' href='style.css'></head>
<body>


<div id='level' class='level'>
    <div class='start_platform' id='plat1'></div>
    <div class='platform' style='

                                 '></div>
</div>


    <img id='player' src='img/player.png' style='height:64px;'></img>
    <div class='buttons'>
        <button id='moveleft' onmousedown="OnButtonDownl (this)" onmouseup="OnButtonUpl (this)"><--</button>
        <button id='moveup' onmousedown="OnButtonDownu (this)" onmouseup="OnButtonUpu (this)">^</button>
        <button id='moveright' onmousedown="OnButtonDownr (this)" onmouseup="OnButtonUpr (this)">--></button>
    </div>
</body>

<script type='text/javascript' src='scripts/move.js'></script>
<script type='text/javascript' src='scripts/gravity.js'></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
</html>

JS (move.js):

//move left
var elem = document.getElementById("player");
function OnButtonDownl (button) 
  var posl = parseInt(document.getElementById("player").style.left, 10) || 0;
window.idl = setInterval(framel, 5);
function framel() 
    posl--;
    elem.style.left = posl + 'px';
    gravityCheck();

function OnButtonUpl (button) 
    clearInterval(idl);


//move right
var elem = document.getElementById("player");
function OnButtonDownr (button) 
var posr = parseInt(document.getElementById("player").style.left, 10) || 0;
window.idr = setInterval(framer, 5);
function framer() 
    posr++;
    elem.style.left = posr + 'px';
    gravityCheck();

function OnButtonUpr (button) 
    clearInterval(idr);


//move up
var elem = document.getElementById("player");
function OnButtonDownu () 
var posu = parseInt(document.getElementById("player").style.bottom, 10) || 0;
window.idu = setInterval(frameu, 5);
elem.style.bottom = 0;
function frameu() 
    gravity = false;
    posu++;
    elem.style.bottom = posu + 'px';

function OnButtonUpu (button) 
    clearInterval(idu);

JS (gravity.js):

var gravity = true;
function gravityCheck() 
var player = parseInt(document.getElementById("player").style.left, 10) || 0;
var plat1 = parseInt(document.getElementById("plat1").style.left, 10) || 0;

var width = player - plat1;

    var elem = document.getElementById("player");
    var pos = parseInt(document.getElementById("player").style.bottom, 10) || 0;
    window.id = setInterval(frame, 5);
    function frame() 
    if(width > 100 && width < 164) 
    if(gravity = true) 
        pos--;
        elem.style.bottom = pos + 'px';
        if(elem.style.bottom = 0) 
            clear();
        
    
    
    
function clear() 
clearInterval(id);

我该如何解决这个问题。提前致谢。

【问题讨论】:

【参考方案1】:

您可能没有正确清除。在设置间隔之前清除之前设置的任何一个。

if(window.idl) clearInterval(window.idl);
window.idl = setInterval(framel, 5);

【讨论】:

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