Node.js URL.protocol API
url.protocol 是 url 模块中 url 类的内置应用编程接口，用于获取和设置 URL 的协议部分。当使用特殊协议之一解析 URL 时，url.protocol 属性可以更改为另一个特殊协议，但不能更改为非特殊协议，反之亦然。
语法:
const url.protocol
返回值:返回 URL 的协议部分。
下面的例子说明了 url.protocol 方法在 Node.js 中的使用:
例 1:
java 描述语言
// Node program to demonstrate the
// url.protocol API as Setter
// Importing the module 'url'
const http = require('url');
// Creating and initializing myURL
const myURL = new URL('https://geeksforgeeks.org:80/foo#ram');
// Display href value of myURL before change
console.log("Before Change");
console.log(myURL.href);
// Assigning protocol portion
// using protocol
console.log();
myURL.protocol = 'http';
// Display href value of myURL after change
console.log("After Change");
console.log(myURL.href);
输出:
Before Change
https://geeksforgeeks.org:80/foo#ram
After Change
http://geeksforgeeks.org/foo#ram
示例 2: 本示例将特殊协议更改为非特殊协议。
java 描述语言
// Node program to demonstrate the
// url.protocol API as Setter
// Importing the module 'url'
const http = require('url');
// Creating and initializing myURL
const myURL = new URL('https://geeksforgeeks.org:80/foo#ram');
// Display href value of myURL before change
console.log("Before Change");
console.log(myURL.href);
// Assigning protocol portion
// with non special protocol
// using protocol
console.log();
myURL.protocol = 'xyz';
// Display href value of myURL after change
console.log("After Change");
console.log(myURL.href);
输出:
Before Change
https://geeksforgeeks.org:80/foo#ram
After Change
https://geeksforgeeks.org:80/foo#ram
例 3:
java 描述语言
// Node program to demonstrate the
// url.protocol API as Getter
// Importing the module 'url'
const http = require('url');
// Creating and initializing myURL
const myURL = new URL('https://geeksforgeeks.org:80/foo#ram');
// Getting the protocol portion
// using protocol
const protocol = myURL.protocol;
// Display hash value
console.log("Protocol of current url is : " + protocol);
输出:
Protocol of current url is : https:
注意:以上程序将使用节点 myapp.js 命令编译运行。 参考:https://nodejs.org/api/url.html#url_url_protocolT9】
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