《JavaScript启示录》学习笔记——第2章 对象与属性

//点表示法
var cody = {};
cody.name = 'foo';
console.log(cody.name);//foo
cody.name = 'bar';
console.log(cody.name);//bar

//中括号表示法
var cody2 = {};
cody2['name'] = 'foo';
console.log(cody2['name']);//foo
cody2['name'] = 'bar';
console.log(cody2['name']);//bar

//访问属性键时
var cody3 = { name:'foo' };
var s1 = 'na', s2 = 'me';
console.log(cody3[s1 + s2]); //foo

//属性名称为JavaScript无效标识符时
var cody4 = {'123':123, 'class':'class' };//数字，保留关键字
console.log(cody4['123'], cody4['class']);//123 class