[英]Javascript function for moving div with arrow keys not working?
我一直试图仅使用键盘上的箭头键在页面上移动div。 似乎没有用。 我之前有它工作过,但是由于某种原因它不再工作了。 您能告诉我您的想法是什么吗? 我觉得它与window.onkeydown和onkeyup有关。
感谢您的任何帮助。
CSS-
#log {
position:absolute;
width: 50px;
height: 50px;
border: 2px solid black;
background-color: white;
color: black;
font-size: 20px;
left: 20px;
}
HTML--
<div id="log"></div>
JavaScript-
var Keys = {
up: false,
down: false,
left: false,
right: false
};
var hero = {
x: 0,
y: 0
};
var log = document.getElementById("log");
window.onkeydown = function(e){
var kc = e.keyCode;
e.preventDefault();
if(kc === 37) Keys.left = true;
if(kc === 38) Keys.up = true;
if(kc === 39) Keys.right = true;
if(kc === 40) Keys.down = true;
};
window.onkeyup = function(e){
var kc = e.keyCode;
e.preventDefault();
if(kc === 37) Keys.left = false;
if(kc === 38) Keys.up = false;
if(kc === 39) Keys.right = false;
if(kc === 40) Keys.down = false;
};
function main() {
move();
};
function move(){
if(Keys.up){
hero.y -= 10;
var p = hero.y;
var t = p + 10;
log.style.top = p + "px";
log.style.bottom = t + "px";
//color();
}
if(Keys.down){
hero.y += 10;
var g = hero.y;
var q = g - 10;
log.style.bottom = g + "px";
log.style.top = q + "px";
//color();
}
if(Keys.left) {
hero.x -= 10;
var z = hero.x;
var q = z + 10;
log.style.left = z + "px";
log.style.right = q + "px";
//color();
}
if(Keys.right){
hero.x += 10;
var z = hero.x;
var q = z - 10;
log.style.right = z + "px";
log.style.left = q + "px";
// color();
}
}
setInterval(main, 50);
如果您愿意使用jQuery,这可能会对您有所帮助。
$(document).ready(function() {
var hero = $("#log");
var speed = 1;
var direction = {
left: false,
up: false,
right: false,
down: false
};
$(document).on('keydown', function(e) {
var kc = e.keyCode;
e.preventDefault();
if (kc === 37) direction.left = true;
if (kc === 38) direction.up = true;
if (kc === 39) direction.right = true;
if (kc === 40) direction.down = true;
});
$(document).on('keyup', function(e) {
var kc = e.keyCode;
e.preventDefault();
if (kc === 37) direction.left = false;
if (kc === 38) direction.up = false;
if (kc === 39) direction.right = false;
if (kc === 40) direction.down = false;
});
function move() {
if (direction.left) hero.css("left", (hero.position().left - speed) + "px");
if (direction.up) hero.css("top", (hero.position().top - speed) + "px");
if (direction.right) hero.css("left", (hero.position().left + speed) + "px");
if (direction.down) hero.css("top", (hero.position().top + speed) + "px");
}
setInterval(move, 1);
});
这是证明结果的小提琴 。 随时根据您的需求进行自定义。
这是另一个Fiddle,可以接受同时按下的多个按钮。
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