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new URL的使用

基本使用及问题​

new URL() 前面的 "new "表示它是一个构造函数：调用它可以为你创建一个新的 URL 实例；但是如果传入的参数是非法的url，她就会抛出错误。

const urlstring = "this is not a URL"; 
const not_a_url = new URL(urlstring); 
// Uncaught TypeError: URL constructor: "this is not a URL" is not a valid URL.

解决方案​

1. try...catch​

const urlstring = "this is not a URL";
let not_a_url;

try {
   not_a_url = new URL(urlstring);
} catch {
  // we catch and ignore the error
  // not_a_url is already undefined so no need to actually do anything.
}
  • 缺点：代码行数增多，not_a_url 变为使用 let 声明的变量、控制流程复杂

2. URL.canParse()​

const urlstring = "this is not a URL";
const not_a_url = URL.canParse(urlstring) && new URL(urlstring);
// not_a_url = false

  • 缺点：not_a_url的值不再是字符串、兼容性差

3. URL.parse​

const urlstring = "this is not a URL";

const not_a_url = URL.parse(urlstring);
// not_a_url = null

  • 缺点：兼容性差

参考资料 #javascript/url

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