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1.字符串转换成json对象
var txt = ‘{"employees":[‘ + ‘{"firstName":"Bill","lastName":"Gates" },‘ + ‘{"firstName":"George","lastName":"Bush" },‘ + ‘{"firstName":"Thomas","lastName":"Carter" }]}‘; 方法①.var obj = eval ("(" + txt + ")"); 方法②.var obj = JSON.parse(txt);---更安全
访问：document.getElementById("fname").innerHTML=obj.employees[1].firstName
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原文地址：http://www.cnblogs.com/wanshi1989/p/4242527.html
