JavaScript对象属性访问的两种方式

JavaScript对象属性访问的两种方式

object.attribute

object["attribute"]

例如：

var employees = [
{ "firstName":"Bill" , "lastName":"Gates" },
{ "firstName":"George" , "lastName":"Bush" },
{ "firstName":"Thomas" , "lastName": "Carter" }
];
alert(employees[0].lastName);
alert(employees[0]["lastName"]);

1. var employees = [
2. { "firstName":"Bill" , "lastName":"Gates" },
3. { "firstName":"George" , "lastName":"Bush" },
4. { "firstName":"Thomas" , "lastName": "Carter" }
5. ];
6. alert(employees[0].lastName); // 方式一
7. alert(employees[0]["lastName"]); // 方式二