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<h2 id="防止冒泡"><a href="#防止冒泡" class="headerlink" title="防止冒泡"></a>防止冒泡</h2><p>w3c的方法是e.stopPropagation()，IE则是使用e.cancelBubble = true</p>
<p>stopPropagation也是事件对象(Event)的一个方法，作用是阻止目标元素的冒泡事件，但是会不阻止默认行为。什么是冒泡事件？如在一个按钮是绑定一个”click”事件，那么”click”事件会依次在它的父级元素中被触发 。stopPropagation就是阻止目标元素的事件冒泡到父级元素。</p>
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<h2 id="阻止默认行为"><a href="#阻止默认行为" class="headerlink" title="阻止默认行为"></a>阻止默认行为</h2><p>w3c的方法是e.preventDefault()，IE则是使用e.returnValue = false</p>
<p>preventDefault它是事件对象(Event)的一个方法，作用是取消一个目标元素的默认行为。既然是说默认行为，当然是元素必须有默认行为才能被取消，如果元素本身就没有默认行为，调用当然就无效了。什么元素有默认行为呢？如链接<code><a></code>，提交按钮<code><input type=”submit”></code>等。当Event 对象的 cancelable为false时，表示没有默认行为，这时即使有默认行为，调用preventDefault也是不会起作用的。</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br></pre></td><td class="code"><pre><span class="line"> <!DOCTYPE html></span><br><span class="line"><html></span><br><span class="line"><head></span><br><span class="line"> <title><<span class="regexp">/title></span></span><br><span class="line"><span class="regexp"></</span>head></span><br><span class="line"><body></span><br><span class="line"><div id=<span class="string">"box"</span> style=<span class="string">"width: 300px;height: 300px;background: pink;"</span>></span><br><span class="line"> <input type=<span class="string">"button"</span> name=<span class="string">"按钮"</span> value=<span class="string">"按钮"</span> id=<span class="string">"btn"</span>></span><br><span class="line"><<span class="regexp">/div></span></span><br><span class="line"><span class="regexp"><script type="text/</span>javascript<span class="string">"></span></span><br><span class="line"><span class="string"> var box1=document.getElementById("</span>box<span class="string">");</span></span><br><span class="line"><span class="string"> var btn1=document.getElementById("</span>btn<span class="string">");</span></span><br><span class="line"><span class="string"> btn1.onclick=function(e){</span></span><br><span class="line"><span class="string"> alert("</span>按钮<span class="string">");</span></span><br><span class="line"><span class="string"> //阻止冒泡；</span></span><br><span class="line"><span class="string"> var e=e|| window.event;</span></span><br><span class="line"><span class="string"> //w3c取消冒泡</span></span><br><span class="line"><span class="string"> e.stopPropagation();</span></span><br><span class="line"><span class="string"> //ie取消冒泡</span></span><br><span class="line"><span class="string"> //判断他现在的状态，然后给他赋值true，</span></span><br><span class="line"><span class="string"> if(typeof e.cancelBubble=='undefined'){</span></span><br><span class="line"><span class="string"> e.stopPropagation();</span></span><br><span class="line"><span class="string"> }else{</span></span><br><span class="line"><span class="string"> e.cancelBubble=true;</span></span><br><span class="line"><span class="string"> }</span></span><br><span class="line"><span class="string"> }</span></span><br><span class="line"><span class="string"> box1.onclick=function(){</span></span><br><span class="line"><span class="string"> alert("</span>div<span class="string">");</span></span><br><span class="line"><span class="string"> }</span></span><br><span class="line"><span class="string"> document.body.onclick=function(){</span></span><br><span class="line"><span class="string"> alert("</span>body<span class="string">");</span></span><br><span class="line"><span class="string"> }</span></span><br><span class="line"><span class="string"> document.documentElement.onclick=function(){</span></span><br><span class="line"><span class="string"> alert("</span>html<span class="string">");</span></span><br><span class="line"><span class="string"> }</span></span><br><span class="line"><span class="string"> document.onclick=function(){</span></span><br><span class="line"><span class="string"> alert("</span><span class="built_in">document</span><span class="string">");</span></span><br><span class="line"><span class="string"> }</span></span><br><span class="line"><span class="string"></script></span></span><br><span class="line"><span class="string"></body></span></span><br><span class="line"><span class="string"></html></span></span><br></pre></td></tr></table></figure>
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<p><span>本文标题:</span><a href="/bubble.html">JavaScript停止冒泡和阻止浏览器默认行为</a></p>
<p><span>文章作者:</span><a href="/" title="访问 陈宇（cosyer） 的个人博客">陈宇（cosyer）</a></p>
<p><span>发布时间:</span>2018年06月18日 - 19:06</p>
<p><span>最后更新:</span>2020年07月21日 - 23:07</p>
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