js得到get参数

// 假设当前URL为 https://example.com/page?name=John&age=30

// 获取查询字符串部分
const queryString = window.location.search;

// 创建 URLSearchParams 对象
const urlParams = new URLSearchParams(queryString);

// 获取单个参数值
const name = urlParams.get('name'); // "John"
const age = urlParams.get('age');   // "30"

// 遍历所有参数
urlParams.forEach((value, key) => {
  console.log(`${key}: ${value}`);
});

// 假设当前URL为 https://example.com/page?name=John&age=30

function getQueryParamByName(name) {
  const queryStr = window.location.search.substring(1); // 去掉 '?'
  const paramsArray = queryStr.split('&');
  for (let param of paramsArray) {
    const [key, value] = param.split('=');
    if (decodeURIComponent(key) === name) {
      return decodeURIComponent(value);
    }
  }
  return null;
}

const name = getQueryParamByName('name'); // "John"
const age = getQueryParamByName('age');   // "30"

// 假设当前URL为 https://example.com/page?name=John&age=30

function getQueryParamByRegex(name) {
  const regex = new RegExp('[?&]' + name + '=([^&#]*)', 'i');
  const match = window.location.search.match(regex);
  return match ? decodeURIComponent(match[1]) : null;
}

const name = getQueryParamByRegex('name'); // "John"
const age = getQueryParamByRegex('age');   // "30"

const name = urlParams.get('name') || '默认姓名';

const tags = urlParams.getAll('tag'); // ["js", "frontend"]