qs.parse()、qs.stringify()、JSON.parse()、JSON.stringify()使用方法

一、JSON.parse（用于从一个字符串中解析出json 对象）ps:单引号写在{}外，每个属性都必须双引号，否则会抛出异常

let str = '[{"field":"thedate","v1":"20170102"},{"field":"rev_type","v1":"大数据收入"},{"field":"thismonth","v1":"201708"},{"field":"nextmonth","v1":"201709"},{"field":"depart_type","v1":"leader"},{"field":"admin_emp_id","v1":"role"}]';

JSON.parse(str)；//str必须满足引号使用规范，即：双引号和单引号相互嵌套

[

{field: "thedate", v1: "20170102"},

{field: "rev_type", v1: "大数据收入"},

{field: "thismonth", v1: "201708"},

{field: "nextmonth", v1: "201709"},

{field: "depart_type", v1: "leader"},

{field: "admin_emp_id", v1: "role"}

]

二、JSON.stringify（用于从一个对象解析出字符串）

let arr=[

{field: "thedate", v1: "20170102"},

{field: "rev_type", v1: "大数据收入"},

{field: "thismonth", v1: "201708"},

{field: "nextmonth", v1: "201709"},

{field: "depart_type", v1: "leader"},

{field: "admin_emp_id", v1: "role"}

]

JSON.stringify(arr);//全是双引号

"[{"field":"thedate","v1":"20170102"},{"field":"rev_type","v1":"大数据收入"},{"field":"thismonth","v1":"201708"},{"field":"nextmonth","v1":"201709"},{"field":"depart_type","v1":"leader"},{"field":"admin_emp_id","v1":"role"}]"

三、qs.parse()将URL解析成对象的形式

let url = 'method=query_sql_dataset_data&projectId=85&appToken=7d22e38e-5717-11e7-907b-a6006ad3dba0';

 qs.parse(url);//

{method: "query_sql_dataset_data", projectId: "85", appToken: "7d22e38e-5717-11e7-907b-a6006ad3dba0"}

四、qs.stringify(  )将对象解析成URL的形式

let obj= {method: "query_sql_dataset_data", projectId: "85", appToken: "7d22e38e-5717-11e7-907b-a6006ad3dba0", datasetId: " 12564701"};

qs.stringify( obj)//

{method: "query_sql_dataset_data", projectId: "85", appToken: "7d22e38e-5717-11e7-907b-a6006ad3dba0", datasetId: " 12564701"}