json入门

<SCRIPT LANGUAGE="JavaScript"> <!-- var people = { "programmers": [ { "firstName": "Brett", "lastName":"McLaughlin", "email": "brett@newInstance.com" }, { "firstName": "Jason", "lastName":"Hunter", "email": "jason@servlets.com" }, { "firstName": "Elliotte", "lastName":"Harold", "email": "elharo@macfaq.com" } ], "authors": [ { "firstName": "Isaac", "lastName": "Asimov", "genre": "science fiction" }, { "firstName": "Tad", "lastName": "Williams", "genre": "fantasy" }, { "firstName": "Frank", "lastName": "Peretti", "genre": "christian fiction" } ], "musicians": [ { "firstName": "Eric", "lastName": "Clapton", "instrument": "guitar" }, { "firstName": "Sergei", "lastName": "Rachmaninoff", "instrument": "piano" } ] }; alert(people.programmers[0].lastName); //输出programmers的第一个 属性为 lastName的值 people.musicians[1].lastName = "CSSRAIN.CN"; //修改属性的值 alert("修改数据json="+people.musicians[1].lastName); alert(people); //--> </SCRIPT> 注意，数组索引是从零开始的。<br> 所以，这行代码首先访问 people 变量中的数据；然后移动到称为 programmers 的条目，<br> 再移动到第一个记录（[0]）；最后，访问 lastName 键的值。结果是字符串值 “McLaughlin”。<br> 利用这样的语法，可以处理任何 JSON 格式的数据，而不需要使用任何额外的 JavaScript 工具包或 API。<br>