最新版， js 如何獲取url的參數

以下是一些在JavaScript中獲取URL參數的實現方法：

方法1：使用URLSearchParams對象/h3>

// 假設當前URL為 http://example.com/?name=john&age=30
 
const urlParams = new URLSearchParams(window.location.search);
const name = urlParams.get('name'); // "john"
const age = urlParams.get('age'); // "30"

方法2：使用正則表達式解析URL

// 假設當前URL為 http://example.com/?name=john&age=30
 
function getQueryParam(url, paramName) {
  const regex = new RegExp("[?&]" + paramName + "(=([^&#]*)|&|#|$)");
  const results = regex.exec(url);
  if (!results) return null;
  if (!results[2]) return '';
  return decodeURIComponent(results[2].replace(/\+/g, " "));
}
 
const name = getQueryParam(window.location.href, 'name'); // "john"
const age = getQueryParam(window.location.href, 'age'); // "30"

方法3：使用split()方法和數組操作

// 假設當前URL為 http://example.com/?name=john&age=30
 
function getQueryParam(paramName) {
  const url = window.location.search.substr(1);
  const params = url.split('&');
  
  for (let i = 0; i < params.length; i++) {
    const param = params[i].split('=');
    if (param[0] === paramName) {
      return decodeURIComponent(param[1].replace(/\+/g, " "));
    }
  }
  
  return null;
}
 
const name = getQueryParam('name'); // "john"
const age = getQueryParam('age'); // "30"