vue2.0 中事件处理心得

来源：互联网发布：淘宝客厅装饰物编辑：程序博客网时间：2024/06/06 03:45

<!-- self 只是作用在当前的元素上，子元素不出发该函数 -->  <div class="pick-bg" v-show="childselectArea" @click.self="cancelClick">    <div class="pick-com">      <div class="dp-header">        <div class="dp-item dp-left vux-datetime-cancel" data-role="cancel" @click="cancelClick">取消</div>        <!-- stop 阻止事件的冒泡 -->        <div class="dp-item dp-right vux-datetime-confirm" data-role="confirm" @click.stop="sureClick">确定</div>      </div>      <picker :data='addressList' :fixed-columns="columns"  :columns="3" v-model='selectAddList' @on-change='change' ref="picker"></picker>    </div>  </div>

事件捕获

含义:从最特定的事件目标到最不特定的事件目标(document对象)的顺序触发,也就是说事件从最上一级元素开始往下查找，直到捕获到事件目标(target)。
直白点:事件触发顺序父元素->子元素

事件冒泡

含义:从最不精确的对象(document 对象)开始触发，然后到最精确对象(也可以在窗口级别捕获事件，不过必须由开发人员特别指定),也就是说事件从事件目标(target)开始，往上冒泡直到页面的最上一级元素。
直白点:事件触发顺序子元素->父元素

事件冒泡和事件捕获-图解

示意图

Vue2.0中的capture

<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>Title</title>    <script type="text/javascript" src="https://cdn.jsdelivr.net/vue/2.1.3/vue.js"></script>    <style>        * {              box-sizing: border-box;              margin: 0;              padding: 20px;              transition: background 800ms;            }            ul {              height: 100%;              list-style: none;              background: hsl(193, 66%, 85%);            }            li {              height: 100%;              background: hsl(193, 66%, 95%);            }            .highlight {              background: red;            }    </style></head><body><div id="app">  <ul @click="callback($event)">    <li @click="callback($event)">One</li>    <ul @click="callback($event)">      <li @click="callback($event)">Two</li>      <ul @click="callback($event)">        <li @click="callback($event)">Three. Click Me!!!</li>      </ul>    </ul>  </ul></div><script>    var pause = 200;    new Vue({      el: "#app",      methods: {        callback(event) {          var ms = event.timeout = (event.timeout + pause) || 0;          var target = event.currentTarget;          console.log(target);          setTimeout(function() {            target.classList.add('highlight');            setTimeout(function() {              target.classList.remove('highlight');            }, pause);          }, ms);        }      }    })</script></body></html>添加修饰符.capture后 在捕获阶段中监听事件<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>Title</title>    <script type="text/javascript" src="https://cdn.jsdelivr.net/vue/2.1.3/vue.js"></script>    <style>        * {              box-sizing: border-box;              margin: 0;              padding: 20px;              transition: background 800ms;            }            ul {              height: 100%;              list-style: none;              background: hsl(193, 66%, 85%);            }            li {              height: 100%;              background: hsl(193, 66%, 95%);            }            .highlight {              background: red;            }    </style></head><body><div id="app">  <ul @click="callback($event)">    <li @click="callback($event)">One</li>    <ul @click="callback($event)">      <li @click="callback($event)">Two</li>      <ul @click="callback($event)">        <li @click="callback($event)">Three. Click Me!!!</li>      </ul>    </ul>  </ul></div><script>    var pause = 200;    new Vue({      el: "#app",      methods: {        callback(event) {          var ms = event.timeout = (event.timeout + pause) || 0;          var target = event.currentTarget;          console.log(target);          setTimeout(function() {            target.classList.add('highlight');            setTimeout(function() {              target.classList.remove('highlight');            }, pause);          }, ms);        }      }    })</script></body></html>

添加修饰符.capture后 在捕获阶段中监听事件<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>Title</title>    <script type="text/javascript" src="https://cdn.jsdelivr.net/vue/2.1.3/vue.js"></script>    <style>        * {              box-sizing: border-box;              margin: 0;              padding: 20px;              transition: background 800ms;            }            ul {              height: 100%;              list-style: none;              background: hsl(193, 66%, 85%);            }            li {              height: 100%;              background: hsl(193, 66%, 95%);            }            .highlight {              background: red;            }    </style></head><body><div id="app">  <ul @click="callback($event)">    <li @click="callback($event)">One</li>    <ul @click="callback($event)">      <li @click="callback($event)">Two</li>      <ul @click="callback($event)">        <li @click="callback($event)">Three. Click Me!!!</li>      </ul>    </ul>  </ul></div><script>    var pause = 200;    new Vue({      el: "#app",      methods: {        callback(event) {          var ms = event.timeout = (event.timeout + pause) || 0;          var target = event.currentTarget;          console.log(target);          setTimeout(function() {            target.classList.add('highlight');            setTimeout(function() {              target.classList.remove('highlight');            }, pause);          }, ms);        }      }    })</script></body></html>

在Vue.js中，我们用修饰符来达到事件监听是捕获还是冒泡阶段中监听的效果。

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