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Reduce http requests Avoid multiple requests for small resources. You can combine multiple resources into one resource, such as js, because sending network requests is time-consumingcss is placed at the head and js is placed at the bottom of the body It helps to render the page faster. css will block the execution of js, because js will be exec ...

prefacestay A blog with VuePress + Github Pages In, we used VuePress to build a blog. The final effect is as follows: TypeScript Chinese document. In the process of building a blog, out of practical needs, we VuePress blog Optimization: extended Markdown syntax How to write a markdown it plug-in is explained in Analysis of markdown it principle ...

JS 1.this pointing problem this points to a deeper understanding of the address (1) Function call, this points to its caller function foo() { console.log(this.bar); } var bar = "bar1"; var o2 = {bar: "bar2", foo: foo}; var o3 = {bar: "bar3", foo: foo}; foo(); // bar1 o2.foo(); // bar2 foo.call(o3); // bar3 (2 ...

** MVVM ** The two-way data binding of Vue refers to the two-way binding of model (model, that is, the data in Vue instance) and view (view), that is, one will change and the other will change. First, let's understand what MVVM (model view viewmodel) is. In the MVVM architecture, the concept of ViewModel is introduced. ViewModel is equivalen ...

The latest front-end interview question in 2021 (operation method of array in Js) preface Tip: how to count arrays in JS This paper aims at the problems of operating array related methods in the process of front-end interview I don't know if there are any friends who often confuse the methods of operating arrays like me, or are not very ...

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1, Array 1.1 concept of array An array is a collection of data, each of which is called an element. Any type of element can be stored in the array. Arrays are an elegant way to store a set of data under a single variable name. 1.2 creating arrays 1. Create an array with new var array name = new Array(); var arr  =  new&nbsp ...

Using events in vue // Example 1: // parent receive this.$on('test', function (msg) { console.log(msg) // hi }) // children outgoing this.$emit('test', 'hi') // Example 2: // The parent component listens to the outgoing events of the child component <my-component v-hook:created="dosomething"></my-component> // Example 3: // ...

preface: This is a keyword in JavaScript. It is an object automatically generated inside the function body when the function runs. It can only be used inside the function body. In addition, this cannot be assigned during execution. Text: Default binding: Usually, in the case of separate or pure function calls, this points to the global ob ...

JavaScript asynchronous programming The reason why javaScript adopts single thread: because javaScript is used to realize the dynamic interaction of pages, the core of interaction needs to operate dom. This situation determines that it must use single thread model, otherwise complex thread synchronization problems will occur; For example, i ...