JS div匀速移动动画与变速移动动画 - 好文

1.匀速移动代码
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8">
<title>title</title> <style> * { margin: 0; padding: 0; } div { margin-top:
20px; width: 200px; height: 100px; background-color: green; position: absolute;
left: 0; top: 0; } </style> </head> <body> <input type="button"
value="移动到400px" id="btn1"/> <input type="button" value="移动到800px" id="btn2"/>
<div id="dv"> <script src="common.js"></script> <script> //点击按钮移动div
my$("btn1").onclick = function () { animate(my$("dv"), 400); };
my$("btn2").onclick = function () { animate(my$("dv"), 800); }; //匀速动画 function
animate(element, target) { //清理定时器 clearInterval(element.timeId);
element.timeId = setInterval(function () { //获取元素的当前位置 var current =
element.offsetLeft; //移动的步数 var step = 10; step = target > current ? step :
-step; current += step; if (Math.abs(current - target) > Math.abs(step)) {
element.style.left = current + "px"; } else { clearInterval(element.timeId);
element.style.left = target + "px"; } }, 20); } </script> </div> </body> </html>
2.变速移动代码
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8">
<title>title</title> <style> * { margin: 0; padding: 0; } div { margin-top:
20px; width: 200px; height: 100px; background-color: green; position: absolute;
left: 0; top: 0; } </style> </head> <body> <input type="button"
value="移动到400px" id="btn1"/> <input type="button" value="移动到800px" id="btn2"/>
<div id="dv"> <script src="common.js"></script> <script> //点击按钮移动div
my$("btn1").onclick = function () { animate(my$("dv"), 400); };
my$("btn2").onclick = function () { animate(my$("dv"), 800); }; //变速动画 function
animate(element, target) { //清理定时器 clearInterval(element.timeId);
element.timeId = setInterval(function () { //获取元素的当前位置 var current =
element.offsetLeft; //移动的步数 var step = (target-current)/10; step =
step>0?Math.ceil(step):Math.floor(step); current += step; element.style.left =
current + "px"; if(current==target) { //清理定时器 clearInterval(element.timeId); }
}, 20); } </script> </div> </body> </html>
common.js
/** * 获取指定标签对象 * @param id 标签的id属性值 * @returns {Element}根据id属性值返回指定标签对象 */
function my$(id) { return document.getElementById(id); }

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