如何排除掉谷歌分析师GA4里的重复购买次数

function() {// customTask Builder by Simo Ahavavar transactionDeduper = {keyName: '_transaction_ids',cookieExpiresDays: 365};
// DO NOT EDIT ANYTHING BELOW THIS LINEvar readFromStorage = function(key) {if (!window.Storage) {// From: https://stackoverflow.com/a/15724300/2367037var value = '; ' + document.cookie;var parts = value.split('; ' + key + '=');if (parts.length === 2) return parts.pop().split(';').shift();} else {return window.localStorage.getItem(key);}};
var writeToStorage = function(key, value, expireDays) {if (!window.Storage) {var expiresDate = new Date();expiresDate.setDate(expiresDate.getDate() + expireDays);document.cookie = key + '=' + value + ';expires=' + expiresDate.toUTCString();} else {window.localStorage.setItem(key, value);}};
var globalSendHitTaskName = '_ga_originalSendHitTask';
return function(customTaskModel) {
window[globalSendHitTaskName] = window[globalSendHitTaskName] || customTaskModel.get('sendHitTask');var tempFieldObject, dimensionIndex, count, ga, tracker, decorateTimer, decorateIframe, iframe;
customTaskModel.set('sendHitTask', function(sendHitTaskModel) {
var originalSendHitTaskModel = sendHitTaskModel,originalSendHitTask = window[globalSendHitTaskName],canSendHit = true;
var hitPayload, hitPayloadParts, param, val, regexI, trackingId, snowplowVendor, snowplowVersion, snowplowPath, request, originalTrackingId, hitType, nonInteraction, d, transactionId, storedIds;
try {
// transactionDeduperif (typeof transactionDeduper === 'object' && transactionDeduper.hasOwnProperty('keyName') && transactionDeduper.hasOwnProperty('cookieExpiresDays') && typeof sendHitTaskModel.get('&ti') !== 'undefined') {transactionId = sendHitTaskModel.get('&ti');storedIds = JSON.parse(readFromStorage(transactionDeduper.keyName) || '[]');if (storedIds.indexOf(transactionId) > -1 && ['transaction', 'item'].indexOf(sendHitTaskModel.get('hitType')) === -1) {canSendHit = false;} else if (storedIds.indexOf(transactionId) === -1) {storedIds.push(transactionId);writeToStorage(transactionDeduper.keyName, JSON.stringify(storedIds), transactionDeduper.cookieExpiresDays);}}// /transactionDeduper
if (canSendHit) {originalSendHitTask(sendHitTaskModel);}
} catch(e) {originalSendHitTask(originalSendHitTaskModel);}
});
};}

function() {// Change this to match the keyName you added to customTask:var keyName = '_transaction_ids';
var ids = JSON.parse((!!window.Storage ? window.localStorage.getItem(keyName) : {{cookie - _transactionId}}) || '[]');return ids.indexOf({{Ecommerce_Transaction_ID}}) > -1;}