lovecoding
/
VIP30


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    *{
      margin: 0;
      padding: 0;
    }
    #div1{
      width: 200px;
      height: 200px;
      background: red;
      transition: width 1s linear ;
    }
  </style>
</head>
<body>
  <button id="up">放大</button>
  <div id="div1"></div>
  <button id="down">缩小</button>
  <script>
    var div1 = document.getElementById('div1')
    var up = document.getElementById('up')
    var down = document.getElementById('down')

    // up.onclick = function(){
    //   var timer = setInterval(function(){
    //     if(div1.offsetWidth < 500){
    //       div1.style.width = div1.offsetWidth + 10 +'px'
    //     } else{
    //       clearInterval(timer)
    //     }
    //   },10)
    //   // div1.style.width = '500px'
    // }

    up.onclick = function(){
      div1.style.width = '500px'
    }
    down.onclick = function(){
      var timer2 = setInterval(function(){
        if(div1.offsetWidth > 300){
          div1.style.width = div1.offsetWidth - 10 + 'px'
        } else {
          clearInterval(timer2)
        }
      },10)
    }
  </script>
</body>
</html>