This time I will bring you a detailed explanation of Vue list rendering, and a detailed explanation of Vue list rendering. What are the precautions? Here is a practical case, let’s take a look.
Mutation method (mutation method), as the name suggests, will change the original array called by these methods. In contrast, there are also non-mutating methods, such as filter(), concat() and slice(). These do not change the original array, but always return a new array. When using the non-mutation method, you can replace the old array with the new array:
example1.items = example1.items.filter(function (item) { return item.message.match(/Foo/)}) <div id="example"> <div> <button @click="concat()">concat</button> <button @click="slice()">slice</button> <button @click="filter()">filter</button> </div> <ul> <li v-for="item in items"> {{item.list}} </li> </ul> </div> <script> var example = new Vue({ el:"#example", data:{ items:[ {list:5}, {list:6}, {list:7} ], addValue:{list:10} }, methods:{ concat(){ this.items= this.items.concat(this.addValue) }, slice(){ this.items = this.items.slice(1) }, filter(){ this.items = this.items.filter(function(item,index,arr) { return (index > 0) }) } } })
The above operation will not cause Vue to discard the existing DOM and re-render the entire list. Vue implements some smart heuristics to maximize DOM element reuse, so replacing the original array with an array containing the same elements is a very efficient operation
Note
Because## Due to limitations of #JavaScript, Vue cannot detect the following changed arrays:
When you useindex to directly set an item, for example:
vm.items[indexOfItem] = newValueWhen you modify The length of the array, for example:
vm.items.length = newLengthIn order to solve the first type of problem, the following two methods can achieve the same effect as vm.items[indexOfItem] = newValue, and will also trigger the
stateUpdate:
// Vue.set Vue.set(example1.items, indexOfItem, newValue) // Array.prototype.splice example1.items.splice(indexOfItem, 1, newValue)In order to solve the second type of problem, you can use splice:
example1.items.splice(newLength)I believe you have mastered the method after reading the case in this article, more exciting Please pay attention to other related articles on php Chinese website! Related reading:
How to use the tag to write personal favorites in HTML
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