使用javascript手动设置gtag utm参数

// 假设您有一个带有 UTM 参数的 URL
var url = 'https://example.com?utm_source=facebook&utm_medium=social&utm_campaign=summer_sale';

// 解析 URL 获取 UTM 参数
function getUTMParams(url) {
    var params = {};
    var queryString = url.split('?')[1];
    if (queryString) {
        var pairs = queryString.split('&');
        for (var i = 0; i < pairs.length; i++) {
            var pair = pairs[i].split('=');
            params[decodeURIComponent(pair[0])] = decodeURIComponent(pair[1]);
        }
    }
    return params;
}

var utmParams = getUTMParams(url);

// 设置 gtag UTM 参数
function setGtagUTMParams(params) {
    window.dataLayer = window.dataLayer || [];
    window.dataLayer.push({
        'event': 'pageview',
        'utmsource': params.utm_source || '',
        'utmmedium': params.utm_medium || '',
        'utmcampaign': params.utm_campaign || '',
        'utmterm': params.utm_term || '',
        'utmcontent': params.utm_content || ''
    });
}

setGtagUTMParams(utmParams);