postman高级用法之pre-request

一、pre-request

1.简单用法

//获取、设置、删除环境变量
pm.environment.get("variable_key");
pm.environment.set("variable_key", "variable_value");
pm.environment.unset("variable_key");
//获取设定删除全局变量
pm.globals.get("variable_key");
pm.globals.set("variable_key", "variable_value");
pm.globals.unset("variable_key");
//获取普通变量
pm.variables.get("variable_key");
//获取设置、删除集合变量
pm.collectionVariables.get("variable_key");
pm.collectionVariables.set("variable_key", "variable_value");
pm.collectionVariables.unset("variable_key");
​
//发送一个get请求
pm.sendRequest("https://postman-echo.com/get", function (err, response) {
    console.log(response.json());
});

2.发送前置post请求，从中获取cookie，然后应用到第二个请求的header，常用于鉴权

const loginRequest={
    url:"https://www.xxx.com/api/user/login",
    method:"POST",
     header: [
      "Content-Type: application/x-www-form-urlencoded; charset=UTF-8",
     "appVer: 4.4.0",
      ],
  body: {
    mode: 'raw',
    raw: 'loginName=user&loginPwd=pswd'
  }
};
pm.sendRequest(loginRequest,function(err,response){
    r = JSON.parse(JSON.stringify(response));
    for(var x of r.header){
        if(x.key=="Set-Cookie"){
            console.log(x.value);
            pm.collectionVariables.set("cookie",x.value);
        }
    }
  
});