JSON.stringify&JSON.parse、表单序列化

JSON.stringify&JSON.parse、表单序列化

1、JSON.stringify()&JSON.parse()

两者对比

对比	.stringify()	.parse()
定义	json对象->字符串	字符串->json对象
语法	JSON.stringify(value [, replacer] [, space])	JSON.parse(text[, reviver])

1）、JSON.stringify()

(1)JSON.stringify(value）

对象转化为字符串输出

var data = [
    {name: "1", sex:1, age: 1},
    {name: "2", sex:0, age: 2},
    {name: "3", sex:1, age: 3}
];
console.log(JSON.stringify(data));

[{"name":"1","sex":1,"age":1},{"name":"2","sex":0,"age":2},{"name":"3","sex":1,"age":3,"info":{"sex":"male"}}]

(2)JSON.stringify(value [, replacer]）

输出部分数据

var data = [
    {name: "1", sex:1, age: 1},
    {name: "2", sex:0, age: 2},
    {name: "3", sex:1, age: 3}
];
console.log( JSON.stringify(data, ["name", "sex"]));

[{"name":"1","sex":1},{"name":"2","sex":0},{"name":"3","sex":1}]

sex0，1->女、男输出

var data = [
    {name: "1", sex:1, age: 1},
    {name: "2", sex:0, age: 2},
    {name: "3", sex:1, age: 3}
];
var str_json = JSON.stringify(data, function (k, v) {
    if (k === "sex") {
        return ["女", "男"][v];
    }
    return v;
});//sex 0,1->女，男
console.log(str_json);

[{"name":"1","sex":"男","age":1},{"name":"2","sex":"女","age":2},{"name":"3","sex":"男","age":3,"info":{}}]

(3)JSON.stringify(value [, replacer] [, space])

var data = [
    {name: "1", sex:1, age: 1},
    {name: "2", sex:0, age: 2},
    {name: "3", sex:1, age: 3,info:{sex:'male',getSex:function(){return 'sex';}}}
];

var censor = function(key,value){
    if(typeof(value) == 'function'){
         return Function.prototype.toString.call(value)
    }
    return value;
}
console.log(JSON.stringify(data,censor,4))

[
    {
        "name": "1",
        "sex": 1,
        "age": 1
    },
    {
        "name": "2",
        "sex": 0,
        "age": 2
    },
    {
        "name": "3",
        "sex": 1,
        "age": 3,
        "info": {
            "sex": "male",
            "getSex": "function (){return 'sex';}"
        }
    }
]

2）、JSON.parse()

(1)JSON.parse(text)

var data = '[{"name":"1","sex":1,"age":1},{"name":"2","sex":0,"age":2},{"name":"3","sex":1,"age":3}]';
JSON.parse(data);

(2)JSON.parse(text[, reviver])

var data = '[{"name":"1","sex":1,"age":1},{"name":"2","sex":0,"age":2},{"name":"3","sex":1,"age":3}]';
var str_json = JSON.stringify(JSON.parse(data), function (k, v) {
    if (k === "sex") {
        return ["女", "男"][v];
    }
    return v;
});//sex 0,1->女，男
JSON.parse(str_json);

2、jq操作json

1）.serialize()方法

格式：var data = $("#formID").serialize();
功能：将表单内容序列化成一个以&拼接的字符串，键值对的形式，name1=val1&name2=val2&，空格以%20替换。

2）.serializeArray()方法

格式：var jsonData = $("#formID").serializeArray();
功能：将页面表单序列化成一个JSON结构的对象。注意不是JSON字符串。

　

3）.$.param()方法，

格式：var string = $("#formID").param();
功能：可以把json格式数据序列化成字符串形式

     var obj={a:1,b:2};
     $.param(obj);

"a=1&b=2"

4）、自定义方法.serializeJson()

格式：var jsonData = $("#formID").serializeJson();
功能：serializeArray()方法的扩展，格式转换为键值对name：val。

$.fn.serializeJson= function()
{
    var o = {};
    var a = this.serializeArray();
    $.each(a, function(){
        if(o[this.name]){
            if(!o[this.name].push){
                o[this.name] = [o[this.name]];
            }
            o[this.name].push(this.value ||'');
        } else {
            o[this.name] = this.value || '';
        }
    });
    return o;
};