js实现图片缓慢放大缩小效果

时间:2020-05-15 前端小菜bi 人气:0

本文实例为大家分享了图片缓慢放大缩小js实现代码，供大家参考，具体内容如下

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>图片的缓慢缩放</title>
</head>
<script>
  window.onload = function(){
    var btn_big = document.getElementById("big");
    var btn_small = document.getElementById("small");
    var pic = document.getElementById("pic");
    //缓慢放大
    btn_big.onclick = function(){
      var width = parseInt(pic.style.width);
      var i = width;
      var count = 0;
      console.log(width);
      var timer = setInterval(function(){
        count++;
        i++;
        pic.style.width = i + "%";
        if(count == 10 ){
          clearInterval(timer);
        }else if( i > 50){
          btn_big.onclick = function(e){
            btn_big.onclick = null;
          };
        }
      },13);
    };
 
    //缓慢缩小
    btn_small.onclick = function(){
      var width = parseInt(pic.style.width);
      var count = 0;
      if(width == 10){
        alert("图片已最小!!");
        return false;
      }
      console.log(width);
      var timer2 = setInterval(function(){
        count++;
        width--;
        pic.style.width = width +"%";
        if(count == 10){
          clearInterval(timer2);
        }else if( width < 10){
          btn_small.onclick = null;
        }
      },13);
    }
  }
</script>
<style>
  #pic{
    width: 20%;
  }
</style>
<body>
  <div id="pic" style="width: 20%">
    <img src="3.pic.jpg" style="width:100%;">
  </div>
 
  <div class="scale">
    <button id="big">放大</button> <button id="small">缩小</button>
  </div>
</body>
</html>

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