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    \r\n    \r\n        

    子元素<\/p>\r\n        父元素\r\n    <\/div>\r\n

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    Home Web Front-end JS Tutorial How to understand the non-bubble of jQuery mouseenter method?

    How to understand the non-bubble of jQuery mouseenter method?

    Jun 28, 2017 am 09:51 AM
    jquery how

    Code:

    <!DOCTYPE html>
    <html>
    <head>
    <meta charset="utf-8">
    <title>jQ--mouseenter測試</title>
    <style>
    *{margin: 0; padding: 0; color: #fff;}
    div{width: 100px; height: 100px; padding-top: 20px; background: green; margin: 100px auto;}
    p{width: 150px; height: 50px; background: red;}
    </style>
    <script src="jquery.js"></script> <!-- 1.9.0版 -->
    </head>
    <body>
        <div id="d">
            <p>子元素</p>
            父元素
        </div>
    <script>
    var a=0;
    $(function(){ 
        $(&#39;#d&#39;).mouseenter(function(){    /*#d,父元素,當(dāng)mouseenter時(shí)背景變?yōu)楹谏?/ 
            $(this).css(&#39;background&#39;,&#39;#000&#39;);
        });
        $(&#39;#d p&#39;).mouseenter(function(){    /*#d p,子元素,當(dāng)mouseenter時(shí)背景變?yōu)楹谏?/      
            $(this).css(&#39;background&#39;,&#39;#000&#39;);
        });    
    });

    **When the mouse moves into the child element, I thought only the background of the child element turns black because .mouseenter() does not bubble, but the result is that both the parent and child elements are It turned black. I don't understand. The mouseenter doesn't bubble. Then only the background of the child elements should turn black. Why has everything changed? Please explain! **

    1) The fact that mouseenter does not bubble means that when an element captures the mouseenter event, its parent element will no longer be notified, and the parent element will not process the mouseenter time. 2) Regarding the question 2 mouseenter

    //只要元素進(jìn)入div#d區(qū)域,mouseenter事件就會被觸發(fā)
    //一個(gè)mouse要進(jìn)入一個(gè)子元素,必然經(jīng)過其父元素,故鼠標(biāo)達(dá)到子元素觸發(fā)mouseenter后其父元素的mouseenter事件也會被觸發(fā)
    $(&#39;#d&#39;).mouseenter(function(){    /*#d,父元素,當(dāng)mouseenter時(shí)背景變?yōu)楹谏?/ 
        $(this).css(&#39;background&#39;,&#39;#000&#39;);
    });
    //只要元素進(jìn)入div#d p區(qū)域,也就是div#d的子元素p區(qū)域是,mouseenter事件就會被觸發(fā)
    //但是此時(shí)div#d上的mouseenter事件監(jiān)聽不會再被觸發(fā),因?yàn)闆]有冒泡上去
    $(&#39;#d p&#39;).mouseenter(function(){    /*#d p,子元素,當(dāng)mouseenter時(shí)背景變?yōu)楹谏?/      
        $(this).css(&#39;background&#39;,&#39;#000&#39;);
    });

    It still seems difficult to understand, so let’s take a look at what the bubbling mouseover looks like

    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="UTF-8">
        <title></title>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <script src="../script/jquery-2.1.3.min.js"></script>
        <script>
            $(function(){
                /*
                $(&#39;#d&#39;). mouseover(function(){
                    $(this).css(&#39;background&#39;,&#39;orange&#39;);
                    if(!$(this).data(&#39;data-count&#39;)){
                        $(this).data(&#39;data-count&#39;,1)
                    }else{
                        $(this).data(&#39;data-count&#39;,$(this).data(&#39;data-count&#39;)+1);
                    }
                    $(this).find(&#39;span&#39;).text($(this).data(&#39;data-count&#39;));
                });
    
                $(&#39;#d p&#39;).mouseover(function(){
                    $(this).css(&#39;background&#39;,&#39;yellow&#39;);
                    if(!$(this).data(&#39;data-count&#39;)){
                        $(this).data(&#39;data-count&#39;,1)
                    }else{
                        $(this).data(&#39;data-count&#39;,$(this).data(&#39;data-count&#39;)+1);
                    }
                    $(this).text($(this).data(&#39;data-count&#39;));
                });
                */
                $(&#39;#d&#39;). mouseenter(function(){
                    $(this).css(&#39;background&#39;,&#39;orange&#39;);
                    if(!$(this).data(&#39;data-count&#39;)){
                        $(this).data(&#39;data-count&#39;,1)
                    }else{
                        $(this).data(&#39;data-count&#39;,$(this).data(&#39;data-count&#39;)+1);
                    }
                    $(this).find(&#39;span&#39;).text($(this).data(&#39;data-count&#39;));
                });
    
                $(&#39;#d p&#39;).mouseenter(function(){
                    $(this).css(&#39;background&#39;,&#39;yellow&#39;);
                    if(!$(this).data(&#39;data-count&#39;)){
                        $(this).data(&#39;data-count&#39;,1)
                    }else{
                        $(this).data(&#39;data-count&#39;,$(this).data(&#39;data-count&#39;)+1);
                    }
                    $(this).text($(this).data(&#39;data-count&#39;));
                });
    
            });
    
        </script>
    </head>
    <body>
    <div id="d" style="width:200px;height:200px;background-color: greenyellow">
        <span>父元素</span>
        <p style="padding:5px;width:100px;height:100px;background-color: red;display:block">子元素</p>
    </div>
    </body>
    </html>

    When we run the above code, we can see that every time the mouse enters the child When an element triggers the mouseover event, it will bubble up to its parent element and execute the parent element's mouseover event listener - the displayed number will increase
    . However, this will not happen if the mouseenter event listener is used - the displayed number will not increase.
    And prevent bubbling-stopPropagation in the mouseover event listening function of the child element, so that the event of the parent element will not be called back

    The above is the detailed content of How to understand the non-bubble of jQuery mouseenter method?. For more information, please follow other related articles on the PHP Chinese website!

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