1. Basic use of filters
1 <!DOCTYPE html>
2 <html lang="en">
3 <head>
4 <meta charset="UTF-8">
5 <meta name="viewport" content="width=device-width, initial-scale=1.0">
6 <meta http-equiv="X-UA-Compatible" content="ie=edge">
7 <title>Document</title>
8 </head>
9 <body>
10 <div id="app">
11 {{Date()|dateFrm}}
12 </div>
13 </body>
14 <script src="vue2.4.4.js"></script>
15 <script>
16 new View({
17 el:"#app",
18 data:{},
19 methods:{},
20 mounted:{},
21 filters:{
22 // The first parameter of the method in the filter The first parameter is: the object data of the current call filter
23 dateFrm:function(time){
24 // return "2017-11-16";
25 console.log(time);
26
27 }
28 }
29 });
30 </script>
31 </html>
2. Examples of private filter usage
1 <!DOCTYPE html>
2 <html lang="en">
3
4 <head>
5 <meta charset="UTF-8">
6 <meta name="viewport" content="width=device-width, initial-scale=1.0">
7 <meta http-equiv="X-UA-Compatible" content="ie=edge">
8 <title>Document</title>
9 <style>
10 #app {
11 width: 600px;
12 margin: 10px auto;
13 }
14
15 .tb {
16 border-collapse: collapse;
17 width: 100%;
18 }
19
20 .tb th {
21 background-color: #0094ff;
22 color: white;
23 }
24
25 .tb td,
26 .tb th {
27 padding: 5px;
28 border: 1px solid black;
29 text-align: center;
30 }
31
32 .add {
33 padding: 5px;
34 border: 1px solid black;
35 margin-bottom: 10px;
36 }
37 </style>
38 </head>
39
40 <body>
41 <div id="app">
42 <div class="add">
43 编号: <input id="id" v-color="color" v-focus="focus" type="text" v-model="id">品牌名称: <input v-model="name" type="text">
44 <button @click="add">添加</button>
45 </div>
46 <div class="add">品牌名称：<input type="text"></div>
47 <div>
48 <table class="tb">
49 <tr>
50 <th>number</th>
51 <th>Brand Name</th>
52 <th>Founded</th>
53 <th>Operation</th>
54 </tr>
55 <tr v-if="list.length <= 0">
56 <td colspan="4">No brand data</td>
57 </tr>
58 <!-- When adding: key="index", all parameters must be written completely -->
59 <tr v-for="(item,key,index) in list" :key="index">
60 <td>{{item.id}}</td>
61 <td>{{item.name}}</td>
62 <td>{{item.ctime | dateFrm("/") |addNoon}}</td>
63 <!-- When using vue to register events, we can't see it in the dom element -->
64 <td><a href="javascript:void(0)" @click="del(item.id)">删除</a></td>
65 </tr>
66 </table>
67 </div>
68
69 </div>
70 </body>
71
72 </html>
73 <script src="vue2.4.4.js"></script>
74 <script>
75 // First define the custom instruction
76 // directive has two parameters
77 //Parameter 1: Custom instruction v-focus
78 //Parameter two: object, many methods can be added to the object
79 // Add an inserted method: and this method has two parameters:
80 //Parameter 1: el The object currently using the custom command
81 //Parameter two: obj refers to the expression set after it (v-color="color" )
82 //{expression:"color",value:"red",}
83 Vue.directive("focus", {
84 inserted: function (el, obj) {
85 // console.log(el);
86 el.focus ();
87 }
88 });
89 Vue.directive("color", {
90 inserted: function (el, obj) {
91 // obj.style.color = "red";
92 obj.style.color = obj.value;//????????????
93 console.log(obj.value);
94 }
95 });
96
97 var vm = new Vue({
98 el: "#app",
99 data: {
100 color: "green",
101 id: 0,
102 name: '',
103 list: [
104 { "id": 1, "name": "itcast", "ctime": Date() },
105 { "id": 2, "name": "黑马", "ctime": Date() }
106 ]
107 },
108 // mounted(){
109 // this.getFocus()
110 // },
111 methods: {
112 add: function () {
113 //Push id and name to the list array
114 this.list.push({ "id": this.id, "name": this.name, "ctime": Date() });
115 },
116 del: function (id) {
117
118 // Get the subscript according to the id
119 // By default, traverse the list collection and pass each element in the collection into the function's item,
120 var index = this.list.findIndex(function (item) {
121 //According to the id attribute in the item to determine whether the item is in the above id
122 //Corresponding data, if it returns a true, if it returns false, continue to traverse the following data, and so on
123 return item.id == id; //If it returns true, the findIndex method will return the id corresponding to this item to the outside for acceptance
124 });
125 // Delete the corresponding data in the list set according to the subscript
126 // splice (start to delete subscript, delete length)
127 this.list.splice(index, 1);
128 }
129
130 },
131 filters: {
132 // Private filter: the first parameter of the method in the filter The first parameter is: the object data of the current call filter
133 dateFrm: function (time,spliceStr) {
134 // return "2017-11-16";
135 var date = new Date(time);
136 // get year
137 var year = date.getFullYear();
138 // get month
139 var month = date.getMonth() + 1;
140 // get day
141 var day = date.getDate();
142 return year+spliceStr+month+spliceStr+day;
143 },
144 addNoon:function(time) {
145 return time+"afternoon";
146 }
147 }
148 });
149
150 </script>
2. Global/public filters
1 <!DOCTYPE html>
2 <html lang="en">
3
4 <head>
5 <meta charset="UTF-8">
6 <meta name="viewport" content="width=device-width, initial-scale=1.0">
7 <meta http-equiv="X-UA-Compatible" content="ie=edge">
8 <title>Document</title>
9 <style>
10 #app {
11 width: 600px;
12 margin: 10px auto;
13 }
14
15 .tb {
16 border-collapse: collapse;
17 width: 100%;
18 }
19
20 .tb th {
21 background-color: #0094ff;
22 color: white;
23 }
24
25 .tb td,
26 .tb th {
27 padding: 5px;
28 border: 1px solid black;
29 text-align: center;
30 }
31
32 .add {
33 padding: 5px;
34 border: 1px solid black;
35 margin-bottom: 10px;
36 }
37 </style>
38 </head>
39
40 <body>
41 <div id="app">
42 <div class="add">
43 编号: <input id="id" v-color="color" v-focus="focus" type="text" v-model="id">品牌名称: <input v-model="name" type="text">
44 <button @click="add">添加</button>
45 </div>
46 <div class="add">品牌名称：<input type="text"></div>
47 <div>
48 <table class="tb">
49 <tr>
50 <th>number</th>
51 <th>Brand Name</th>
52 <th>Founded</th>
53 <th>Operation</th>
54 </tr>
55 <tr v-if="list.length <= 0">
56 <td colspan="4">No brand data</td>
57 </tr>
58 <!-- When adding: key="index", all parameters must be written completely -->
59 <tr v-for="(item,key,index) in list" :key="index">
60 <td>{{item.id}}</td>
61 <td>{{item.name}}</td>
62 <td>{{item.ctime | dateFrm("/") |addNoon}}</td>
63 <!-- When using vue to register events, we can't see it in the dom element -->
64 <td><a href="javascript:void(0)" @click="del(item.id)">删除</a></td>
65 </tr>
66 </table>
67 </div>
68
69 </div>
70 </body>
71
72 </html>
73 <script src="vue2.4.4.js"></script>
74 <script>
75 // Use global filter (public filter)
76 Vue.filter("dateFrm", function (time,spliceStr) {
77 // return "2017-11-16";
78 var date = new Date(time);
79 // get the year
80 var year = date.getFullYear();
81 // get month
82 var month = date.getMonth() + 1;
83 // get day
84 var day = date.getDate();
85 return year + spliceStr + month + spliceStr + day;
86 });
87
88
89 // First define the custom instruction
90 // directive has two parameters
91 //Parameter 1: Custom instruction v-focus
92 //Parameter two: object, many methods can be added to the object
93 // Add an inserted method: and this method has two parameters:
94 //Parameter 1: el The object currently using the custom command
95 //Parameter two: obj refers to the expression set after it (v-color="color" )
96 //{expression:"color",value:"red",}
97 Vue.directive("focus", {
98 inserted: function (el, obj) {
99 // console.log(el);
100 el.focus ();
101 }
102 });
103 Vue.directive("color", {
104 inserted: function (el, obj) {
105 // obj.style.color = "red";
106 obj.style.color = obj.value;//????????????
107 console.log(obj.value);
108 }
109 });
110
111 var vm = new Vue({
112 el: "#app",
113 data: {
114 color: "green",
115 id: 0,
116 name: '',
117 list: [
118 { "id": 1, "name": "itcast", "ctime": Date() },
119 { "id": 2, "name": "黑马", "ctime": Date() }
120 ]
121 },
122 // mounted(){
123 // this.getFocus()
124 // },
125 methods: {
126 add: function () {
127 //Push id and name to the list array
128 this.list.push({ "id": this.id, "name": this.name, "ctime": Date() });
129 },
130 del: function (id) {
131
132 // Get the subscript according to the id
133 // By default, traverse the list collection and pass each element in the collection into the function's item,
134 var index = this.list.findIndex(function (item) {
135 //According to the id attribute in the item to determine whether the item is in the above id
136 //Corresponding data, if it returns a true, if not, return false, continue the traversal of the following data, and so on
137 return item.id == id; //If it returns true, the findIndex method will return the id corresponding to this item to the outside for acceptance
138 });
139 // Delete the corresponding data in the list set according to the subscript
140 // splice (start to delete subscript, delete length)
141 this.list.splice(index, 1);
142 }
143
144 }
145 });
146
147 </script>