js get url 参数

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

// 方法一：使用URLSearchParams接口
const params = new URLSearchParams(window.location.search);
const name = params.get('name'); // "John"
const age = params.get('age'); // "30"

// 方法二：使用正则表达式
const queryString = window.location.search.substring(1); // 去除开头的'?'
const paramsArray = queryString.split('&');
const paramsObj = {};
paramsArray.forEach(param => {
  const [key, value] = param.split('=');
  paramsObj[decodeURIComponent(key)] = decodeURIComponent(value);
});
console.log(paramsObj.name); // "John"
console.log(paramsObj.age); // "30"

// 方法三：使用window.location对象
const nameDirect = window.location.search.match(/name=([^&]+)/);
const ageDirect = window.location.search.match(/age=([^&]+)/);
const nameValue = nameDirect ? decodeURIComponent(nameDirect[1]) : null; // "John"
const ageValue = ageDirect ? decodeURIComponent(ageDirect[1]) : null; // "30"