json in javascript

注意：只需要在前台页面中引入相应的javascript即可测试Js代码<mce:script type="text/javascript" src="scripts/json/json2.js" mce_src="scripts/json/json2.js"></mce:script> <mce:script type="text/javascript" src="scripts/json/jsonmessage.js" mce_src="scripts/json/jsonmessage.js"></mce:script> <mce:script type="text/javascript" src="scripts/json/json2.js" mce_src="scripts/json/json2.js"></mce:script><mce:script type="text/javascript" src="scripts/json/jsonmessage.js" mce_src="scripts/json/jsonmessage.js"></mce:script>一、在javascript中使用JSON创建一个对象Js代码//创建一个空对象 var JSONObject = {} //创建一个新的对象 var JSONObject = new Object() //创建一个包含属性的对象，其中名称为字符串，年龄为整型 var JSONObject = { "name":"kevin", "age":23 } //创建一个空对象var JSONObject = {}//创建一个新的对象var JSONObject = new Object()//创建一个包含属性的对象，其中名称为字符串，年龄为整型var JSONObject = { "name":"kevin", "age":23} 和java中类似，我们可以通过点(.)操作符取得对象的属性。Js代码var JSONObject = { "name":"kevin", "age":24, }; alert("JSONObject.name:"+JSONObject.name); alert("JSONObject.age:"+JSONObject.age); var JSONObject = { "name":"kevin", "age":24,};alert("JSONObject.name:"+JSONObject.name);alert("JSONObject.age:"+JSONObject.age);二、在javascript中使用JSON创建数组对象创建一个Student对象，里面包含两个数组对象,每个数组对象中，包含Student对象的属性。Js代码var student = { //第一个数组对象Class "Class":[ { "name":"kevin", "className":"java", "age":23 }, { "name":"yang", "className":"java", "age":24 } ], //第二个数组对象 "Score":[ { "name":"shower", "score":100 }, { "name":"zheng", "score":100 } ] } var i=0; for(i=0;i<student.Class.length;i++){ alert("student.Class["+i+"].name===>"+student.Class[i].name); alert("student.Class["+i+"].className===>"+student.Class[i].className); alert("student.Class["+i+"].age===>"+student.Class[i].age); } for(i=0;i<student.Score.length;i++){ alert("student.Score["+i+"].name===>"+student.Score[i].name); alert("student.Score["+i+"].score===>"+student.Score[i].score); } var student = { //第一个数组对象Class "Class":[ { "name":"kevin", "className":"java", "age":23 }, { "name":"yang", "className":"java", "age":24 } ], //第二个数组对象 "Score":[ { "name":"shower", "score":100 }, { "name":"zheng", "score":100 } ]}var i=0;for(i=0;i<student.Class.length;i++){ alert("student.Class["+i+"].name===>"+student.Class[i].name); alert("student.Class["+i+"].className===>"+student.Class[i].className); alert("student.Class["+i+"].age===>"+student.Class[i].age);}for(i=0;i<student.Score.length;i++){ alert("student.Score["+i+"].name===>"+student.Score[i].name); alert("student.Score["+i+"].score===>"+student.Score[i].score);} 三、使用JSON在javascript中创建消息Js代码//create a Student Object var Student = { "Math":[{ "name":"kevin", "mark":70, "age":23 },{ "name":"smart", "mark":40, "age":25 } ], "Science":[{ "name":"kevin2", "mark":70, "age":23 },{ "name":"smart2", "mark":40, "age":25 } ] } //print array value var i = 0; var array = new Array(); for(i=0;i<Student.Math.length;i++){ array.push(Student.Math[i].name); array.push(Student.Math[i].mark); array.push(Student.Math[i].age); } for(i=0;i<Student.Science.length;i++){ array.push(Student.Science[i].name); array.push(Student.Science[i].mark); array.push(Student.Science[i].age); } alert("array==>"+array); //This method produce a JSON text from a JavaScript value. //这个方法将一个JavaScript值转换为一个JSON字符串 alert("array.toJSONString()==>"+array.toJSONString()); alert("String.parseJSON==>"+array.toJSONString().parseJSON()); var data2 = array.toJSONString().parseJSON(); if(data2 instanceof Array){ alert("Array"); }