浅谈JQ中mouseover和mouseenter的区别

Z时代
2024-01-10
分类：综合

mouseenter事件只会触发一次，触发对象是注册对象或者注册对象的子元素

mouseover事件可以触发多次，触发对象是注册对象或者注册对象的子元素


<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
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<body>
  <p>不论鼠标指针穿过被选元素或其子元素，都会触发 mouseover 事件。</p> 
  <p>只有在鼠标指针穿过被选元素时，才会触发 mouseenter 事件。</p> 
  <div class="over" style="background-color:lightgray;padding:20px;width:40%;float:left"> 
    <h2 style="background-color:white;">被触发的 Mouseover 事件：<span></span></h2> 
  </div> 
  <div class="enter" style="background-color:lightgray;padding:20px;width:40%;float:right"> 
      <h2 style="background-color:white;">被触发的 Mouseenter 事件：<span></span></h2> 
  </div> 
  <script>
    var x = 0,y = 0;
    var div1 = document.getElementsByClassName("over")[0];
    div1.addEventListener("mouseover",function(){
      var span = this.getElementsByTagName("span")[0]
      span.innerText = (x +=1);
      span.style.cssText = "border:2px red solid;";
    },false);
    var div2 = document.getElementsByClassName("enter")[0];
    div2.addEventListener("mouseenter",function(){
      var span = this.getElementsByTagName("span")[0]
      span.innerText = (y +=1);
      span.style.cssText = "border:2px red solid;";
    },false);
  </script>
</body>
</html>