93 lines
2.5 KiB
JavaScript
93 lines
2.5 KiB
JavaScript
/**
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* 全站渠道首次归因。
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* 与落地页约定一致，按 dc、ch、pc 顺序识别，并同步到 localStorage 与 cookie。
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*/
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(function (global) {
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"use strict";
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var STORAGE_KEY = "channel";
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var QUERY_KEYS = ["dc", "ch", "pc"];
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function clean(value) {
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return String(value == null ? "" : value).trim();
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}
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function readStorage() {
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try {
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return clean(global.localStorage.getItem(STORAGE_KEY));
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} catch (e) {
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return "";
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}
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}
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function writeStorage(channel) {
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try {
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global.localStorage.setItem(STORAGE_KEY, channel);
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} catch (e) {}
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}
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function readCookie() {
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try {
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var match = document.cookie.match(/(?:^|;\s*)channel=([^;]*)/);
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return match ? clean(decodeURIComponent(match[1])) : "";
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} catch (e) {
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return "";
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}
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}
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function writeCookie(channel) {
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try {
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var secure = global.location && global.location.protocol === "https:" ? "; Secure" : "";
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document.cookie =
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STORAGE_KEY +
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"=" +
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encodeURIComponent(channel) +
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"; Path=/; Max-Age=31536000; SameSite=Lax" +
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secure;
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} catch (e) {}
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}
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function readQuery() {
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try {
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var params = new URLSearchParams(global.location.search || "");
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for (var i = 0; i < QUERY_KEYS.length; i += 1) {
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var channel = clean(params.get(QUERY_KEYS[i]));
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if (channel) return channel;
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}
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} catch (e) {}
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return "";
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}
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function syncTracker(channel) {
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try {
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if (global.tracker && typeof global.tracker.setChannel === "function") {
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global.tracker.setChannel(channel);
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}
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} catch (e) {}
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}
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function capture() {
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// localStorage 与服务端 cookie 都属于已归因结果，必须先于当前 URL。
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var channel = readStorage() || readCookie() || readQuery();
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if (!channel) return "";
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writeStorage(channel);
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writeCookie(channel);
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global.__CHANNEL_CODE__ = channel;
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syncTracker(channel);
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return channel;
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}
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global.ChannelAttribution = {
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get: capture,
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capture: capture,
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};
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var channel = capture();
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try {
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document.dispatchEvent(
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new CustomEvent("channel:ready", { detail: { channel: channel } })
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);
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} catch (e) {}
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})(window);
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