js获取参数

function getQueryParam(param) {
    const params = new URLSearchParams(window.location.search);
    return params.get(param);
}

// 使用示例
console.log(getQueryParam('name')); // 输出: John

function getQueryParamManual(param) {
    const queryString = window.location.search.substring(1);
    const params = queryString.split('&');
    for (let i = 0; i < params.length; i++) {
        const pair = params[i].split('=');
        if (decodeURIComponent(pair[0]) === param) {
            return decodeURIComponent(pair[1]);
        }
    }
    return null;
}

// 使用示例
console.log(getQueryParamManual('age')); // 输出: 30

const encodedParam = encodeURIComponent('John Doe');
console.log(encodedParam); // 输出: John%20Doe

const decodedParam = decodeURIComponent(encodedParam);
console.log(decodedParam); // 输出: John Doe