如何正确使用javascript 来进行我们的程序开发(2)

//bad if(currentUser){ function test(){ console.log('Nope.'); } } //good var test; if(currentUser){ test = function(){ console.log('Yup'); }; //be careful with the semi-colon. }

Properties (属性)
使用点语法来访问属性.

var luke = { jedi: true, age: 28 }; //bad var isJedi = luke['jedi']; //good var isJedi = luck.jedi;

当使用变量访问对象属性时,使用 [] 方括号来访问

var luke = { jedi: true, age: 28 }; function getProp(prop) { return luke[prop]; } var isJedi = getProp('jedi');