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<!DOCTYPE html>
<html class="theme-next pisces use-motion" lang="">
<head>
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fancybox: true,
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<a class="post-title-link" href="/2019/10/17/什么时候需要保存this/" itemprop="url">什么时候需要保存this?</a></h1>
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,
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<blockquote>
<p><a href="https://www.imooc.com/wenda/detail/312105" target="_blank" rel="noopener">https://www.imooc.com/wenda/detail/312105</a></p>
</blockquote>
<p>javascript中this什么时候可以直接调用?什么时候要把它赋值给一个变量后才能调用?</p>
<ul>
<li><p>1) 避免多层this</p>
<pre><code> var o = {
f1: function() {
console.log(this);
var f2 = function() {
console.log(this);
}();
}
}
o.f1()
</code></pre><p> 上面代码包含两层this,结果运行后,第一层指向该对象,第二层指向全局对象。一个解决方法是在第二层改用一个指向外层this的变量。</p>
<pre><code> var o = {
f1: function() {
console.log(this);
var that = this;
var f2 = function() {
console.log(that);
}();
}
}
o.f1()
</code></pre><p> 上面代码定义了变量that,固定指向外层的this,然后在内层使用that,就不会发生this指向的改变。</p>
</li>
</ul>
<ul>
<li><p>2) 避免数组处理方法中的this</p>
<p> 数组的map和foreach方法,允许提供一个函数作为参数。这个函数内部不应该使用this。</p>
<pre><code> var o = {
v: 'hello',
p: [ 'a1', 'a2' ],
f: function f() {
this.p.forEach(function (item) {
console.log(this.v+' '+item);
});
}}
o.f()
</code></pre><p> 上面代码中,foreach方法的参数函数中的this,其实是指向window对象,因此取不到o.v的值。</p>
<p> 解决这个问题的一种方法,是使用中间变量。</p>
<pre><code> var o = {
v: 'hello',
p: [ 'a1', 'a2' ],
f: function f() {
var that = this;
this.p.forEach(function (item) {
console.log(that.v+' '+item);
});
}}
o.f()
</code></pre><p> 另一种方法是将this当作foreach方法的第二个参数,固定它的运行环境。</p>
<pre><code> var o = {
v: 'hello',
p: [ 'a1', 'a2' ],
f: function f() {
this.p.forEach(function (item) {
console.log(this.v+' '+item);
}, this);
}}
o.f()
</code></pre></li>
<li><p>3) 避免回调中的this</p>
<pre><code> var o = new Object();o.f = function (){
console.log(this === o);}o.f()
</code></pre><p> 上面代码表示,如果调用o对象的f方法,其中的this就是指向o对象。</p>
<p> 但是,如果将f方法指定给某个按钮的click事件,this的指向就变了。</p>
<pre><code> $('#button').on('click', o.f);
</code></pre></li>
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<a class="post-title-link" href="/2019/10/10/vue的一些知识整理/" itemprop="url">vue的一些知识整理</a></h1>
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<div class="post-body" itemprop="articleBody">
<h2 id="父子组件传值"><a href="#父子组件传值" class="headerlink" title="父子组件传值"></a>父子组件传值</h2><ul>
<li><p>父组件向子组件传值</p>
<pre><code> //html
//1.父组件通过v-bind给子组件传值
<todo-item v-bind:content="data1"></todo-item>
//script
//定义全局组件
Vue.component("TodoItem", {
//2.子组件通过props接收
props: ['content']
//也可以用对象形式进行参数校验
//props: {content: String}//只允许接受string
template: "<li>{{content}}</li>"
})
var app = new Vue({
...
data: {
data1: "ted"
}
})
</code></pre></li>
<li><p>子组件向父组件传值</p>
<pre><code> //html
//2.父组件使用子组件时,通过v-on监听触发的事件
//一旦子组件delete触发,就会触发父组件handleItemDelete这个方法
<todo-item v-on:delete="handleItemDelete">
</todo-item>
//script
var TodoItem = {
data: {
data1: 'ted'
},
template: "<li v-on:click='handleButtonClick'>点我删除</li>",
methods: {
handleButtonClick: function() {
//1.子组件通过$emit向外触发delete事件,并传出data1
this.$emit("delete", data1)
}
}
}
var app = new Vue({
...
methods: {
//3.父组件使用子组件的值
handleItemDelete: function(data1) {
alert("data1")
}
}
})
</code></pre></li>
</ul>
<h2 id="非父子组件传值"><a href="#非父子组件传值" class="headerlink" title="非父子组件传值"></a>非父子组件传值</h2><ul>
<li><p>观察者模式</p>
<pre><code> <!-- 非父子组件传值 -->
<!-- 通过观察者模式实现,两个子组件之间传值,点击其中一个组件,另一个组件的值变成这个被点击组件的值-->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script src="./vue.js"></script>
</head>
<body>
<div id="root">
<child :content="content1"></child>
<child :content="content2"></child>
</div>
<script>
//1. 在Vue的prototype上定义一个bus
Vue.prototype.bus = new Vue()
Vue.component('child', {
props: {
content: String
},
template: '<div v-on:click="handleClick">{{content}}</div>',
methods: {
handleClick: function() {
//使用bus向外触发事件
this.bus.$emit('change', this.content)
}
},
//利用钩子函数,监听change事件
mounted: function() {
var this_ = this
this.bus.$on('change', function(msg) {
this_.content = msg
})
}
})
var vm = new Vue({
el: "#root",
data: {
content1: "tedqin",
content2: "teddymoon"
}
})
</script>
</body>
</html>
</code></pre></li>
<li>vuex</li>
</ul>
<h2 id="全局组件和局部组件"><a href="#全局组件和局部组件" class="headerlink" title="全局组件和局部组件"></a>全局组件和局部组件</h2><ul>
<li><p>全局组件:用Vue.component()方法定义,其他组件可以直接使用</p>
<pre><code> //html
//父组件通过v-bind给子组件传值
<todo-item v-bind:content="data1"></todo-item>
//script
//定义全局组件
Vue.component("TodoItem", {
//子组件通过props接收
props: ['content']
template: "<li>{{content}}</li>"
})
var app = new Vue({
...
data: {
data1: "ted"
}
})
</code></pre></li>
<li><p>局部组件:像普通对象一样定义,其他组件引用的时候需要注册</p>
<pre><code> //html
//父组件通过v-bind给子组件传值
<todo-item v-bind:content="data1"></todo-item>
//script
//定义局部组件
var TodoItem = {
props: ['content']
template: "<li>{{content}}</li>"
}
var app = new Vue({
...
//把局部逐渐注册到到需要引用它的组件的vue实例中
components: {
TodoItem: TodoItem
}
data: {
data1: "ted"
}
})
</code></pre></li>
</ul>
<h2 id="v-bind-v-model-v-for和v-on"><a href="#v-bind-v-model-v-for和v-on" class="headerlink" title="v-bind,v-model,v-for和v-on"></a>v-bind,v-model,v-for和v-on</h2><ul>
<li><p>v-bind:用于给标签/组件绑定属性,实现动态管理标签的属性</p>
<pre><code> //html
<a v-bind:href="url">网络测试</a> //v-bind绑定href
//script
var app = new Vue({
...
data {
url: "http://www.baidu.com"
}
})
</code></pre><pre><code> //html
//父组件通过v-bind给子组件传值
<todo-item v-bind:content="data1"></todo-item>
//script
Vue.component("TodoItem", {
//子组件通过props接收
props: ['content']
template: "<li>{{content}}</li>"
})
var app = new Vue({
...
data: {
data1: "ted"
}
})
</code></pre></li>
<li><p>v-model:实现数据和视图层的双向绑定,只能定义在input,select,textarea上,绑定之后随着input输入的变化,对应绑定的内容也变化,反之也变化</p>
<pre><code> //html
<input type="text" v-model="inputValue" />
//script
var app = new Vue({
...
data: {
inputValue: ''
}
})
</code></pre></li>
<li><p>v-for:循环data</p>
<pre><code> //循环数组
//html
<li v-for="item of list">{{item.text}}</li>
<li v-for="(item, index) of list">{{item.text}}---{{index}}</li>
<li v-for="(item, index) of list" :key="item.id">{{item.text}}---{{index}}</li> <!--用index的时候最好再用key唯一标识-->
//script
var app = new Vue({
...
data: {
list: [{
id: "1",
text: "ted"
}, {
id: "2",
text: "xxy"
}]
}
})
</code></pre><pre><code> //循环对象
//html
<li v-for="(item, key, index) of list">{{item}}--{{key}}--{{index}}</li>
<!--输出"ted--name--0 23--age--1"-->
//script
var app = new Vue({
...
data: {
list: {
name: "ted",
age: "23"
}
}
})
</code></pre></li>
<li><p>v-on:绑定事件</p>
<pre><code> //html
<button v-on:click="handleButtonClick">提交</button>
//script
var app = new Vue({
...
methods: {
handleButtonClick: function() {
alert("click!")
}
}
})
</code></pre></li>
</ul>
<h2 id="v-text和v-html的区别"><a href="#v-text和v-html的区别" class="headerlink" title="v-text和v-html的区别"></a>v-text和v-html的区别</h2><ul>
<li>v-text: 等同于插值表达式双括号,绑定当前元素的innerText,会原封不动的输出纯文本</li>
<li><p>v-html: 绑定当前元素的innerText,会以html规则编译文本内容后输出</p>
<pre><code> //html
<div v-text="name"></div> <!--输出<h1>ted</h1>-->
<div v-html="name"></div> <!--输出h1大小的ted-->
//script
var vm = new Vue({
el:"#app",
data: {
name:"<h1>ted</h1>"
}
})
</code></pre></li>
</ul>
<h2 id="计算属性-computed"><a href="#计算属性-computed" class="headerlink" title="计算属性 computed"></a>计算属性 computed</h2><p>和逻辑有关的计算都放在computed中,不方便直接在模版中计算</p>
<p>例子:</p>
<ul>
<li><p>get属性</p>
<pre><code> <div id="example">
<p>Original message: "{{ message }}"</p>
<p>Computed reversed message: "{{ reversedMessage }}"</p>
</div>
var vm = new Vue({
el: '#example',
data: {
message: 'Hello'
},
computed: {
// 计算属性的 getter
reversedMessage: function () {
// `this` 指向 vm 实例
return this.message.split('').reverse().join('')
}
}
})
</code></pre></li>
<li><p>set属性</p>
<pre><code> computed: {
fullName: {
// getter
get: function () {
return this.firstName + ' ' + this.lastName
},
// setter
set: function (newValue) {
var names = newValue.split(' ')
this.firstName = names[0]
this.lastName = names[names.length - 1]
}
}
}
</code></pre></li>
</ul>
<p>上面代码中,get作用是通过监听firstName和lastName的改变,获取fullName的值;<br>set的所用是传入需要改变的fullName,并根据参数更新firstName和lastName的值</p>
<ul>
<li>和method的不同:<ul>
<li>计算属性中的值依赖data中相关联的值</li>
<li>computed存在缓存机制:每次重新渲染时,对于method,每次都会重新计算;对于计算属性,仅当data中依赖的值改变时,计算属性的值才改变,</li>
</ul>
</li>
</ul>
<h2 id="侦听器-watch"><a href="#侦听器-watch" class="headerlink" title="侦听器 watch"></a>侦听器 watch</h2><p>和computed相似,同样是监听data中的值,当data发生改变时,执行相应的操作<br>也具有缓存效果</p>
<ul>
<li>和computed的不同:<ul>
<li>computed是定义并计算一个新的值,这个值依赖data中的某些值 </li>
<li>watch是监听data中已经存在的变量,并在data发生改变的时候做相应的操作</li>
<li>computed比watch更加简洁</li>
</ul>
</li>
</ul>
<h2 id="样式绑定"><a href="#样式绑定" class="headerlink" title="样式绑定"></a>样式绑定</h2><ul>
<li><p>class绑定:<code>:class=</code>等价于<code>: v-bind:class=</code> ,将class绑定在一个标签上,可以控制class的显示与否</p>
<ul>
<li><p>class的对象绑定 <code>:class="{activated: isActivated}"</code></p>
<pre><code> <style>
.activated {color: red}
</style>
<div @click="handleDivClick>
:class="{activated: isActivated}"></div>
var vm = new Vue({
el: "#app",
data: {
isActicated: false
},
method: {
handleDivClick: function() {
this.isActivated = true
}
}
})
</code></pre></li>
<li>class的数组绑定 <code>:class="[activated]"</code></li>
</ul>
</li>
</ul>
<pre><code> ```
<style>
.activated {color: red}
</style>
<div @click="handleDivClick>
:class="{activated: isActivated}"></div>
var vm = new Vue({
el: "#app",
data: {
activated: ""
},
method: {
handleDivClick: function() {
this.activated = "activated"
}
}
})
```
</code></pre><ul>
<li><p>内联样式绑定</p>
<ul>
<li><p>style的对象绑定 </p>
<pre><code> <div :style="styleObj" v-on:click="handleDivClick"></div>
var vm = new Vue({
el: "#app",
data: {
styleObj: {
color: red
}
},
methods: {
handleDivClick: function() {
this.styleObj.color = red
}
}
})