1语法JSON.stringify(value[,replacer[,space]])一般用法：varuser={name:'andy',isDead:false,age:11,addr:'shanghai'};JSON.stringify(user);"{"name":"andy","isDead":false,"age":11,"addr":"shanghai"}"2扩展用法2.1replacerreplacer可以是函数也可以是数组。函数一：改变属性值，将isDead属性的值翻译成0或1，0对应false，1对应truevaruser={name:'andy',isDead:false,age:11,addr:'上海'};JSON。stringify(user,function(key,value){if(key==='isDead'){returnvalue===true?1:0;}returnvalue;});"{"name":"andy","isDead":0,"age":11,"addr":"shanghai"}"函数二：删除一个属性删除isDead属性。如果替换器的返回值未定义，则该属性将被删除。varuser={name:'andy',isDead:false,age:11,addr:'shanghai'};JSON.stringify(user,function(key,value){if(key==='isDead'){returnundefined;}returnvalue;});"{"name":"andy","age":11,"addr":"shanghai"}"函数三：通过数组过滤一些属性只需要name属性和addr属性，其他没有。varuser={name:'andy',isDead:false,age:11,addr:'shanghai'};JSON.stringify(user,['name','addr']);"{"name":"andy","addr":"shanghai"}"2.2空格可以是数字也可以是字符串，如果是数字表示属性名前加空格符号的个数，如果是字符串直接加字符串在属性名称之前。函数一：输出属性前加n个空格varuser={name:'andy',isDead:false,age:11,addr:'shanghai'};JSON.stringify(user,null,4);"{"name":"andy","isDead":false,"age":11,"addr":"shanghai"}"函数二：tab格式输出varuser={name:'andy',isDead:false,age:11,addr:'shanghai'};JSON.stringify(user,null,'\t');"{"name":"andy","isDead":false,"age":11,"addr":"shanghai"}"函数3：有趣的JSON.stringify(user,null,'good');"{good"name":"andy",good"isDead":false,good"age":11,good"addr":“上海”}“2.3深拷贝varuser={name:'andy',isDead:false,age:11,addr:'shanghai'};vartemp=JSON.stringify(用户);varuser2=JSON.parse(temp);3OtherJSON.parse()其实是支持第二个参数的。功能类似于JSON.stringify的第二个参数。4参考MDNJSON.stringify()
