nodejs写个简单的server.js

var http = require("http");var fs = require("fs");var url = require("url");var port = process.argv[2];if (!port) {  console.log("请指定端口号好不啦？\nnode server.js 8888 这样不会吗？");  process.exit(1);}var server = http.createServer(function(request, response) {  var parsedUrl = url.parse(request.url, true);  var pathWithQuery = request.url;  var queryString = "";  if (pathWithQuery.indexOf("?") >= 0) {    queryString = pathWithQuery.substring(pathWithQuery.indexOf("?"));  }  var path = parsedUrl.pathname;  var query = parsedUrl.query;  var method = request.method;  /******** 从这里开始看，上面不要看 ************/  console.log("有个傻子发请求过来啦！路径（带查询参数）为：" + pathWithQuery);  if (path === "/") {    response.statusCode = 200;    response.setHeader("Content-Type", "text/html;charset=utf-8");    response.write(`二哈`);    response.end();  } else if (path === "/x") {    response.statusCode = 200;    response.setHeader("Content-Type", "text/css;charset=utf-8");    response.write(`body{color: red;}`);    response.end();  } else {    response.statusCode = 404;    response.setHeader("Content-Type", "text/html;charset=utf-8");    response.write(`你输入的路径不存在对应的内容`);    response.end();  }  /******** 代码结束，下面不要看 ************/});server.listen(port);console.log(  "监听 " +    port +    " 成功\n请用在空中转体720度然后用电饭煲打开 http://localhost:" +    port);