[Postman] Pre-request Script

一、语法
1、从环境变量获取值
例：从环境变量env获取值
pm.environment.get("env");
二、例子

const xml2js = require('xml2js');

const env = pm.environment.get("env");
if (env === "localhost") return;

const eurekaUrl = pm.environment.get("eureka_url");
const gray = pm.environment.get("env");

let serverName = "best-gw-test";
if (env === "prod") {
    serverName = "best-gw";
} 

pm.sendRequest(eurekaUrl + `/${serverName}`, (err, response) => {
    xml2js.parseString(response.text(), (e, result) => {
        const list = [];
        result.application.instance.map(item => {
            const metadata = item.metadata[0];
            const deployflag = metadata.deployflag ? metadata.deployflag[0] : metadata.envflag[0];
            let url = metadata["management.url"] ? metadata["management.url"][0] : item.homePageUrl[0];
            url = url.substring(0, url.length-1);
            list.push({url: url, gray: deployflag});
        });
        let s = list.find(item => item.gray === gray);
        if (!s) {
            s = list[0];
        }
        console.log(`best gw url: ${s.url}`);
        pm.environment.set("best_gw_url", s.url);
    });
});