js-QuickStart-base.js

// 1.变量（Variables）
    var myVariable;
    myVariable = 'Bob';

    // 数据类型
    string
    number
    boolean
    array
    object

// 2.注释
    /*
    Everything in between is a comment.
    */

// 3.运算符
    +
    -
    *
    /
    =
    ===
    !
    !==  

// 4.语句
    var iceCream = 'chocolate';
    if (iceCream === 'chocolate') {
      alert('Yay, I love chocolate ice cream!');
    } else {
      alert('Awwww, but chocolate is my favorite...');
    }

// 5.函数
    function multiply(num1,num2) {
      var result = num1 * num2;
      return result;
    }
    multiply(4,7);

// 6.事件
    document.querySelector('html').onclick = function() {
        alert('Ouch! Stop poking me!');
    }