JavaScript学习笔记02–基本运算符（basic operators）

  1.+=

let x =15;
x += 10 ;//x = x + 10 = 25;

  2.*=

let x =15;
x *= 10 ;//x = x * 10 = 150

   3.++

let x =15;
x ++  ;//x = x + 1 = 16

   4.–

let x =15;
x --  ;//x = x - 1 = 14

  5.运算符的优先级

    详细参考mdn中的介绍：https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Operator_Precedence