1.2.3.14.框架小叮嚀：空格

• 空格 (whitespace)

  • 創造看不到空間的字母, 如enter鍵, tab鍵, 空白鍵

• 在許多知名的函式庫的中會看到程式碼間有許多註解跟空白, 例如

var 
    // first name of the person
    firstname,

    // last name of the person
    lastname,

    //the language
    // can be 'en' or 'es'
    language;


var person = {
    // the first name
    firstname: 'John',

    //the last name
    // (always required)
    lastname: 'Doe'
}