JSON.stringify 详细用法

1.常用[object]

var user = {
    name:'Tomson',
    age:,
    lastName:'Smith',
    family:{
        father:{
            name:'Tom',
            age:,
            lastName:'John'
        }
    }
}
           

var jsonStr = JSON.stringify(user);
console.log(jsonStr);

//控制台输出：
// {"name":"Tomson","age":,"lastName":"Smith","family":{"father":{"name":"Tom","age":,"lastName":"John"}}}
           

2.两个参数[object，filterFunc]

var filter = function(key,value){
    if(typeof value == 'string'){
        return value.toUpperCase();
    }
    return value;
}
var jsonStr = JSON.stringify(user,filter);
console.log(jsonStr);

//控制台输出：
//{"name":"TOMSON","age":,"lastName":"SMITH","family":{"father":{"name":"TOM","age":,"lastName":"JOHN"}}}
           

3.三个参数[object，filterFunc，indent]

var jsonStr = JSON.stringify(user,filter,);
console.log(jsonStr);

//控制台输出
{
    "name": "TOMSON",
    "age": ,
    "lastName": "SMITH",
    "family": {
        "father": {
            "name": "TOM",
            "age": ,
            "lastName": "JOHN"
        }
    }
}
           

小结：

JSON.stringify(args1,args2,agrs3)

args1:json对象

args2:过滤函数func(key,value)

key：遍历到的属性名key

value:遍历到的属性值value

args3:缩进的字符数

传入此参数则格式化输出，输出缩进args3个字符的json字符串