Javascript 基礎

宣告

var message;

字串

var message = '哈囉';
var name = "alincode";

數字

var num1 = 1;
var num2 = 1.5;

等於

• ===：Strict equality
• ==：Loose equality

var x = 5;
console.log(x == 5); 
console.log(x == "5");
console.log(x === "5");

陣列

var people = [{
    firstname: 'ailin',
    lastname: 'liou'

  },{
    firstname: 'Jane',
    lastname: 'Doe'
  }
];

var lang = ['中文', '英文'];

// 陣列長度
lang.length;

lang.forEach(function(item) {
    console.log(item);
});

函式

function greet() {
    console.log('哈囉');
}

greet();

callback 函式

var lang = ['中文', '英文'];

function callback(item) {
    console.log(item);
}

lang.forEach(callback);