js中如何获得url中参数

function getUrlParams() {
    var params = {};
    var search = window.location.search.substring(1);
    var pairs = search.split('&');

    for (var i = 0; i < pairs.length; i++) {
        var pair = pairs[i].split('=');
        var key = decodeURIComponent(pair[0]);
        var value = decodeURIComponent(pair[1] || '');
        params[key] = value;
    }

    return params;
}

// 使用示例
var urlParams = getUrlParams();
console.log(urlParams); // 输出：{param1: "value1", param2: "value2"}

var encodedParam = encodeURIComponent('特殊字符!');
console.log(encodedParam); // 输出：%E7%89%B9%E6%AE%8A%E5%AD%97%E7%AC%A6!

var decodedParam = decodeURIComponent(encodedParam);
console.log(decodedParam); // 输出：特殊字符!

function getUrlParams() {
    var params = {};
    var search = window.location.search.substring(1);
    var pairs = search.split('&');

    for (var i = 0; i < pairs.length; i++) {
        var pair = pairs[i].split('=');
        var key = decodeURIComponent(pair[0]);
        var value = decodeURIComponent(pair[1] || '');

        if (params[key]) {
            if (!Array.isArray(params[key])) {
                params[key] = [params[key]];
            }
            params[key].push(value);
        } else {
            params[key] = value;
        }
    }

    return params;
}

// 使用示例
var urlParams = getUrlParams();
console.log(urlParams); // 输出：{param1: ["value1", "value1_2"], param2: "value2"}