Getting started with Vue.js + supplementing JavaScript

I am very proficient in using yii thinkphp and other frameworks to do projects. Is it necessary to learn vue and reactjs to change the front-end development model? The answer is yes!

Arrow function

x => x * x

The above arrow function is equivalent to:

function (x) {
    return x * x;
}

var fun = x => x * x;

let

let is block scope, var is function and global scope, the new standard advocates using let to replace var.

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