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Learn more about Vue's built-in filters

青灯夜游

Oct 21, 2020 pm 06:00 PM

vuefilter

Learn more about Vue's built-in filters

过滤器是一个通过输入数据，能够及时对数据进行处理并返回一个数据结果的简单函数。Vue有很多很便利的过滤器，本文为大家介绍了vue自带的9种过滤器，希望对大家有一定的帮助。

一、过滤器写法

{{ message | Filter}}

二、Vue自带的过滤器:capitalize

功能:首字母大写

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>Vue自带的过滤器</title>
        <meta name="viewport" content="width=device-width,initial-scale=1,
        minimum-scale=1,maximum-scale=1,user-scalable=no" />
        <script src="../js/vue.js" type="text/javascript" charset="utf-8"></script>
    </head>
    <body>
        <div class="test">
            {{message | capitalize}}
        </div>
        <script type="text/javascript">
            var myVue = new Vue({
                el: ".test",
                data: {
                    message: "abc"
                }
            })
        </script>
    </body>
</html>

代码输出:Abc

三、Vue自带的过滤器:uppercase

功能:全部大写

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>Vue自带的过滤器</title>
        <meta name="viewport" content="width=device-width,initial-scale=1,
        minimum-scale=1,maximum-scale=1,user-scalable=no" />
        <script src="../js/vue.js" type="text/javascript" charset="utf-8"></script>
    </head>
    <body>
        <div class="test">
            {{message | uppercase}}
        </div>
        <script type="text/javascript">
            var myVue = new Vue({
                el: ".test",
                data: {
                    message: "abc"
                }
            })
        </script>
    </body>
</html>

代码输出:ABC

四、Vue自带的过滤器:uppercase

功能:全部小写

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>Vue自带的过滤器</title>
        <meta name="viewport" content="width=device-width,initial-scale=1,
        minimum-scale=1,maximum-scale=1,user-scalable=no" />
        <script src="../js/vue.js" type="text/javascript" charset="utf-8"></script>
    </head>
    <body>
        <div class="test">
            {{message | lowercase}}
        </div>
        <script type="text/javascript">
            var myVue = new Vue({
                el: ".test",
                data: {
                    message: "ABC"
                }
            })
        </script>
    </body>
</html>

代码输出:abc

五、Vue自带的过滤器:currency

功能:输出金钱以及小数点

参数:

第一个参数 {String} [货币符号] - 默认值: '$'

第二个参数 {Number} [小数位] - 默认值: 2

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>Vue自带的过滤器</title>
        <meta name="viewport" content="width=device-width,initial-scale=1,
        minimum-scale=1,maximum-scale=1,user-scalable=no" />
        <script src="../js/vue.js" type="text/javascript" charset="utf-8"></script>
    </head>
    <body>
        <div class="test">
            {{message | currency}} <!--输出$123.47-->
            {{message | currency &#39;¥&#39; "1"}} <!--输出$123.5-->
        </div>
        <script type="text/javascript">
            var myVue = new Vue({
                el: ".test",
                data: {
                    message: "123.4673"
                }
            })
        </script>
    </body>
</html>

六、Vue自带的过滤器:pluralize

功能: 如果只有一个参数，复数形式只是简单地在末尾添加一个 “s”。如果有多个参数，参数被当作一个字符串数组，对应一个、两个、三个…复数词。如果值的个数多于参数的个数，多出的使用最后一个参数。

参数：{String} single, [double, triple, ...

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>Vue自带的过滤器</title>
        <meta name="viewport" content="width=device-width,initial-scale=1,
        minimum-scale=1,maximum-scale=1,user-scalable=no" />
        <script src="../js/vue.js" type="text/javascript" charset="utf-8"></script>
    </head>
    <body>
        <div class="test">
        {{message}}    {{message | pluralize &#39;item&#39;}} <!--输出: 1 item-->
        
            <ul v-for="item in lili">
                <li>
                    {{item}}    {{item | pluralize &#39;item&#39;}} 
                    <!--输出: 1  item 2    items 3    items-->
                </li>
            </ul>
            
            <ul v-for="item in lili">
                <li>
                    {{item}}    {{item | pluralize &#39;st&#39; &#39;rd&#39;}} 
                    <!--输出: 1    st 2    rd 3    rd-->
                </li>
            </ul>
            
            <ul v-for="item in man">
                <li>
                    {{item}}    {{item | pluralize &#39;item&#39;}}
                     <!--输出: 1    item 2    items 3    items-->
                </li>
            </ul>
            
            <ul v-for="item in man">
                <li>
                    {{item}}    {{item | pluralize &#39;st&#39; &#39;rd&#39;}} 
                    <!--输出: 1    st 2    rd 3    rd-->
                </li>
            </ul>
        </div>
        <script type="text/javascript">
            var myVue = new Vue({
                el: ".test",
                data: {
                    message: 1,
                    lili: [1,2,3],
                    man: {
                        name1: 1,
                        name2: 2,
                        name3: 3
                    }
                }
            })
        </script>
    </body>
</html>

七、Vue自带的过滤器:debounce

(1)限制：需在@里面使用

(2)参数:{Number} [wait] - 默认值： 300

(3)功能：包装处理器，让它延迟执行 x ms，默认延迟 300ms。包装后的处理器在调用之后至少将延迟 x ms，如果在延迟结束前再次调用，延迟时长重置为 x ms。

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>Vue自带的过滤器</title>
        <meta name="viewport" content="width=device-width,initial-scale=1,
        minimum-scale=1,maximum-scale=1,user-scalable=no" />
        <script src="../js/vue.js" type="text/javascript" charset="utf-8"></script>
    </head>
    <body>
        <div class="test">
          <button id="btn" @click="disappear | debounce 10000">点击我,我将10秒后消失</button>
        </div>
        <script type="text/javascript">
            var myVue = new Vue({
                el: ".test",
                methods: {
                    disappear: function () {
                       document.getElementById("btn").style.display= "none";
                    }
                }
            })
        </script>
    </body>
</html>

八、Vue自带的过滤器:limitBy

(1)限制:需在v-for(即数组)里面使用

(2)两个参数:

第一个参数:{Number} 取得数量

第二个参数:{Number} 偏移量

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>Vue自带的过滤器</title>
        <meta name="viewport" content="width=device-width,initial-scale=1,
        minimum-scale=1,maximum-scale=1,user-scalable=no" />
        <script src="../js/vue.js" type="text/javascript" charset="utf-8"></script>
    </head>
    <body>
        <div class="test">
            <ul v-for="item in lili | limitBy 10"> <!--输出1 2 3 4 5 6 7 8 9 10-->
                <li>{{item}}</li>
            </ul>
            <ul v-for="item in lili | limitBy 10 3">
            <!--输出 4 5 6 7 8 9 10 11 12 13-->
                <li>{{item}}</li>
            </ul>
        </div>
        <script type="text/javascript">
            var myVue = new Vue({
                el: ".test",
                data: {
                    lili: [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]
                }
            })
        </script>
    </body>
</html>

九、Vue自带的过滤器:filterBy

(1)限制:需在v-for(即数组)里面使用

(2)三个参数:

第一个参数: {String | Function} 需要搜索的字符串

第二个参数: in (可选,指定搜寻位置)

第三个参数: {String} (可选,数组格式)

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>Vue自带的过滤器</title>
        <meta name="viewport" content="width=device-width,initial-scale=1,
        minimum-scale=1,maximum-scale=1,user-scalable=no" />
        <script src="../js/vue.js" type="text/javascript" charset="utf-8"></script>
    </head>
    <body>
        <div class="test">
            <ul v-for="item in lili | filterBy &#39;o&#39; "> <!--输出oi oa lo ouo oala-->
                <li>{{item}}</li>
            </ul>
            
            <ul v-for="item in man | filterBy &#39;l&#39; in &#39;name&#39; "> <!--输出lily lucy-->
                <li>{{item.name}}</li>
            </ul>
            
            <ul v-for="item in man | filterBy &#39;l&#39; in &#39;name&#39; &#39;dada&#39; ">
             <!--输出lily+undefined lucy+undefined undefined+lsh-->
                <li>{{item.name+"+"+item.dada}}</li>
            </ul>
        </div>
        <script type="text/javascript">
            var myVue = new Vue({
                el: ".test",
                data: {
                    lili: ["oi", "oa", "ll", "lo" ,"ouo" ,"kk" ,"oala"],
                    man: [   //此处注意man是数组,不是对象
                    {name: "lily"},
                    {name: "lucy"},
                    {name: "oo"},
                    {dada: "lsh"},
                    {dada: "ofg"}
                    ]
                }
            })
        </script>
    </body>
</html>

十、Vue自带的过滤器:orderBy

(1)限制:需在v-for(即数组)里面使用

(2)三个参数:

第一个参数: {String | Array | Function} 需要搜索的字符串

第二个参数: {String} 可选参数 order 决定结果升序（order >= 0）或降序（order

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>Vue自带的过滤器</title>
        <meta name="viewport" content="width=device-width,initial-scale=1,
        minimum-scale=1,maximum-scale=1,user-scalable=no" />
        <script src="../js/vue.js" type="text/javascript" charset="utf-8"></script>
    </head>
    <body>    
        <div class="test">
            <!--遍历数组-->
            <ul v-for="item in lili | orderBy &#39;o&#39; 1"> <!--输出kk ll oi-->
                <li>{{item}}</li>
            </ul>
            
            <ul v-for="item in lili | orderBy &#39;o&#39; -1"> <!--输出oi ll kk-->
                <li>{{item}}</li>
            </ul>
            
            <!--遍历含对象的数组-->
            <ul v-for="item in man | orderBy &#39;name&#39; 1"> <!--输出Bruce Chuck Jackie-->
                <li>{{item.name}}</li>
            </ul>
            
            <ul v-for="item in man | orderBy &#39;name&#39; -1"> <!--输出Jackie Chuck Bruce-->
                <li>{{item.name}}</li>
            </ul>
            
            <!--使用函数排序-->
            <ul v-for="item in man | orderBy ageByTen"> <!--输出Bruce Chuck Jackie-->
                <li>{{item.name}}</li>
            </ul>
        </div>
        <script type="text/javascript">
            var myVue = new Vue({
                el: ".test",
                data: {
                    lili: ["oi", "kk", "ll"],
                    man: [   //此处注意man是数组,不是对象
                  {
                    name: &#39;Jackie&#39;,
                    age: 62
                  },
                  {
                    name: &#39;Chuck&#39;,
                    age: 76
                  },
                  {
                    name: &#39;Bruce&#39;,
                    age: 61
                  }
                ]
                },
                methods: {
                    ageByTen: function () {
                        return 1;
                    }
                }
            })
        </script>
    </body>
</html>

gitHub地址:https://github.com/manlili/vue

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