var employees = [
{ "firstName":"Bill" , "lastName":"Gates" },
{ "firstName":"George" , "lastName":"Bush" },
{ "firstName":"Thomas" , "lastName": "Carter" }
];
employees[1].firstName="Jobs";
document.getElementById("fname").innerHTML=employees[1].firstName;
<h2>通过 JSON 字符串来创建对象</h2> <p>First Name: <span id="fname"></span></p>