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Implementation code sharing of star rating effect in JavaScript

黄舟
黄舟Original
2017-05-21 11:38:541284browse

This article mainly introduces in detail JavaScript to achieve a simple star rating effect, which has a certain reference value. Interested friends can refer to the approximate implementation ideas of

Just use a gray star as the background, then position the colored star picture on the gray star picture, and control the width of the colored star picture to achieve the basic effect. As shown below:

#The code below: 

<html> 
<head> 
  <meta charset="UTF-8"> 
  <title>星星</title> 
  <style> 
    .starnone,.starWrap{ 
      width: 100px; 
      height: 20px; 
    } 
    .starnone{ 
      position: relative; 
      background: url(stars-none20px.png) no-repeat; 
    } 
    .star{ 
      position: absolute; 
      top: 0; 
      left: 0; 
      width: 70%; 
      height: 20px; 
      background: url(stars20px.png) no-repeat; 
    } 
    #num{ 
      width: 30px; 
    } 
  </style> 
</head> 
<body> 
  <p class="starnone"> 
    <p class="starWrap"> 
      <p class="star" id="star"></p> 
    </p> 
  </p> 
  <p> 
    <input type="text" id="num"> % 
    <button id="ok">OK</button> 
  </p> 
  <script> 
    window.onload = function(){ 
      var star = document.getElementById("star"); 
      var okBtn = document.getElementById("ok"); 
      var num = document.getElementById("num"); 
      okBtn.onclick = function(){ 
        var value = parseFloat(num.value); 
        if (value>100) { 
          alert("请小于100"); 
          return; 
        } else if(value<0){ 
          alert("请大于0"); 
          return; 
        } 
        star.style.width = value + "px"; 
      } 
    } 
  </script> 
</body> 
</html>

The two pictures used.


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