javascript----mouseover和mouseenter的區別

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1、代碼(mouseover)

<!DOCTYPE html><html><head><meta charset="UTF-8"><title></title><style type="text/css">.div1{width: 600px;height: 600px;background: red;}div{padding: 20px;}div div{background-color: white;}div div div{background-color: blue;}</style></head><body><div class="div1" id = ‘div1‘><div><div></div></div></div><script>var div1 = document.getElementById("div1");div1.addEventListener("mouseover",function(){ var r = parseInt(Math.random()*255); var g = parseInt(Math.random()*255); var b = parseInt(Math.random()*255); var s = "background:rgb("+r+","+g+","+b+")";  console.log(s);   div1.style = s; })</script></body></html>

  

 

 

2、效果(mouseover)

 

 

 3、總結

mouseover會給子節點也綁定事件,傳說中的冒泡事件,所以出現滑鼠移動過程中觸發三次事件

 

1、代碼(mouseenter)

 

 

 

<!DOCTYPE html><html><head><meta charset="UTF-8"><title></title><style type="text/css">.div1{width: 600px;height: 600px;background: red;}div{padding: 20px;}div div{background-color: white;}div div div{background-color: blue;}</style></head><body><div class="div1" id = ‘div1‘><div><div></div></div></div><script>var div1 = document.getElementById("div1");div1.addEventListener("mouseenter",function(){ var r = parseInt(Math.random()*255); var g = parseInt(Math.random()*255); var b = parseInt(Math.random()*255); var s = "background:rgb("+r+","+g+","+b+")";  console.log(s);   div1.style = s; })</script></body></html><!--<!DOCTYPE html><html><head><meta charset="UTF-8"><title></title><style type="text/css">.div1{width: 600px;height: 600px;background: red;}div{padding: 20px;}div div{background-color: white;}div div div{background-color: blue;}</style></head><body><div class="div1" id = ‘div1‘><div><div></div></div></div><script>var div1 = document.getElementById("div1");div1.addEventListener("mouseover",function(){ var r = parseInt(Math.random()*255); var g = parseInt(Math.random()*255); var b = parseInt(Math.random()*255); var s = "background:rgb("+r+","+g+","+b+")";  console.log(s);   div1.style = s; })</script></body></html>-->

  

 

2、效果(mouseenter)

 

 

3、總結

mouseenter不是給子節點也綁定事件,也就是說,事件沒有冒泡,所以在滑鼠移動過程中只觸發一次事件

 

javascript----mouseover和mouseenter的區別

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