效果：
代码：
1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>缓动动画</title> 6 <style> 7 *{ 8 margin: 0; 9 padding: 0; 10 } 11 div{ 12 position: absolute; 13 left: 0; 14 top: 100px; 15 width: 100px; 16 height: 100px; 17 background-color: yellow; 18 } 19 </style> 20 </head> 21 <body> 22 <div></div> 23 <button class="btn1">点击到500</button> 24 <button class="btn2">点击到800</button> 25 <script> 26 function animate(obj, target){ 27 clearInterval(obj.timer); 28 obj.timer = setInterval(function(){ 29 //计算步长值 30 //把步长值改成整数,不要出现小数问题 31 var step = (target - obj.offsetLeft) / 10; 32 step = step > 0 ? Math.ceil(step) : Math.floor(step); 33 if(obj.offsetLeft == target){ 34 // 停止动画本质上是停止定时器 35 clearInterval(obj.timer); 36 } 37 obj.style.left = obj.offsetLeft + step + 'px'; 38 },10); 39 } 40 var div = document.querySelector('div'); 41 var btn1 = document.querySelector('.btn1'); 42 var btn2 = document.querySelector('.btn2'); 43 //调用函数 44 45 btn1.addEventListener('click', function(){ 46 animate(div, 500); 47 }); 48 btn2.addEventListener('click', function(){ 49 animate(div, 800); 50 }); 51 </script> 52 </body> 53 </html>