js+url编码+参数加号

// 编码
let encodedParam = encodeURIComponent('Hello World! This is a test.');
console.log(encodedParam); // 输出: Hello%20World!%20This%20is%20a%20test.

// 解码
let decodedParam = decodeURIComponent(encodedParam);
console.log(decodedParam); // 输出: Hello World! This is a test.

// 手动将空格替换为加号
let paramWithSpaces = 'Hello World! This is a test.';
let encodedParamWithPlus = paramWithSpaces.replace(/ /g, '+');
console.log(encodedParamWithPlus); // 输出: Hello+World!+This+is+a+test.

// 解码时将加号还原为空格
let decodedParamWithSpaces = encodedParamWithPlus.replace(/\+/g, ' ');
console.log(decodedParamWithSpaces); // 输出: Hello World! This is a test.

// 编码时保留加号
let paramWithPlus = 'Hello+World';
let encodedParamWithPlus = encodeURIComponent(paramWithPlus);
console.log(encodedParamWithPlus); // 输出: Hello%2BWorld

// 服务器端解码时保留加号
let decodedParamWithPlus = decodeURIComponent(encodedParamWithPlus);
console.log(decodedParamWithPlus); // 输出: Hello+World