导入系统模块：const querystring = require('querystring');
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const querystring = require('querystring')
let param = 'foo=bar&abc=123&abc=456'
//param方法将字符串转成对象
let obj = querystring.parse(param)
console.log(obj)
//------------------------------------------------
let obj1 = {
foo: 'bar',
abc: [ '123', '456' ]
}
//stringify方法将对象转成字符串
let param1 = querystring.stringify(obj1)
console.log(param1)
