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google analycs4 (ga4) の遅延読み込み

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なんとなくいけてる気がしますので、掲載してみます。

lazy-gtag.js
var MEASUREMENT_ID="G-xxxxxxxx";

$(function() {
	setgtag();
});

function setgtag() {
	setTimeout(function() {
		var gtc = document.createElement("script");
		gtc.innerHTML='window.dataLayer=window.dataLayer||[];function gtag(){dataLayer.push(arguments);}gtag("js",new Date());gtag("config", MEASUREMENT_ID);';

		// 下記はデバッグモード用
		//gtc.innerHTML='window.dataLayer=window.dataLayer||[];function gtag(){dataLayer.push(arguments);}gtag("js",new Date());gtag("config", MEASUREMENT_ID,{"debug_mode":true});';
		document.body.appendChild(gtc);

		var gt=document.createElement("script");
		gt.src='https://www.googletagmanager.com/gtag/js?id=' + MEASUREMENT_ID;
		document.body.appendChild(gt);

	}, 2500);
}

一応デバッガーでもOKが出てます

image.png

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