Mixins are JS objects that can be used to distribute reusable code among components. When a component uses mixin, all options of mixin become a part of the component options.

- Example:
// define a mixin object
var mixin_1 = {
 //function automatically called when Vue instance is created
 created: function(){
 this.hello();
 },
 methods: {
 hello: function(){
 console.log('hello from mixin.')
 }
 }
}

// define a component that uses this mixin
var component = Vue.extend({
 mixins: [mixin_1]
})

var comp = new component() // hello from mixin.
When a mixin and a component contain overlapping options, they are merged. If they contain same function or data object with same key, data from main Vue instance takes priority and will replace mixin's function and data with same key.

- In the following example we have mixin and Vue instance with data object that have same "msg" key.
// define a mixin object
var mixin_2 = {
 //function automatically called when Vue instance is created
 data: function(){
 return {msg: 'Hello from Mixin', str:'String from mixin'};
 }
}

// vue instance
var vm = new Vue({
 mixins: [mixin_2],
 data: {msg:'Msg replaced from component.', txt:'I`m a good person'},
 created: function(){
 console.log(this.$data);
 }
})

// {"msg": "Msg replaced from component.", "txt": "I`m a good person", "str": "String from mixin"}
- In the following example we have a method (here called "same_met") with same name in mixin and Vue instance.
// define a mixin object
var mixin_3 = {
 methods: {
 met_mixin: function(){
 console.log('Just wish and vision frequently its effect')
 },
 same_met: function(){
 console.log('The past not exists')
 }
 }
}

// define a component that uses this mixin
var vm = new Vue({
 mixins: [mixin_3],
 methods: {
 same_met: function(){
 console.log('I am my life')
 },
 met_inst: function(){
 console.log('Miracle is possible')
 }
 }
})

vm.met_inst(); // Miracle is possible
vm.met_mixin(); // Just wish and vision frequently its effect
vm.same_met(); // I am my life
Hook functions with the same name are merged into an array so that all of them will be called. Mixin hooks will be called before the component's hooks.
var mixin_4 ={
 created: function(){
 console.log('mixin - The wish is the request')
 }
}

new Vue({
 mixins: [mixin_4],
 created: function () {
 console.log('component - The vision is to receive')
 }
})

// mixin - The wish is the request
// component - The vision is to receive

Daily Test with Code Example

HTML
CSS
JavaScript
PHP-MySQL
Which attribute is used in <a> tag for the address of the link?
src href rel
<a href="http://coursesweb.net/" title="CoursesWeb.net">CoursesWeb.net</a>
Which CSS property sets the type of the text font?
font-family text-decoration font-size
h2 {
  font-family:"Calibri",sans-serif;
}
What instruction selects all the <div> tags with class="cls"?
querySelector("div.cls") getElementsByTagName("div") querySelectorAll("div.cls")
var elm_list = document.querySelectorAll("div.cls");
var nr_elms = elm_list.length;       // number of selected items
alert(nr_elms);
Indicate the function that can be used to get the sum of values in an array.
array_sum() array_diff() array_shift()
$arr =[1, 2, 3, 4);
$arr_sum = array_sum($arr);
echo $arr_sum;       // 10
Mixins

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