《JavaScript启示录》学习笔记——第2章 对象与属性

获取/设置/更新对象的属性：

//点表示法var cody = {};cody.name = 'foo';console.log(cody.name);//foocody.name = 'bar';console.log(cody.name);//bar//中括号表示法var cody2 = {};cody2['name'] = 'foo';console.log(cody2['name']);//foocody2['name'] = 'bar';console.log(cody2['name']);//bar

 

中括号表示法的优势：

//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