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// isPreviewEnvironment関数と同じロジック const hostname = window.location.hostname; const isPreview = hostname.indexOf('--') !== -1 && hostname.indexOf('.web.app') !== -1; if (!isPreview) { document.write('<iframe src="https://www.googletagmanager.com/ns.html?id=GTM-5W4PSGD&gtm_auth=X5MVZAPO4YKenADeussYCw&gtm_preview=env-1&gtm_cookies_win=x" height="0" width="0" style="display:none;visibility:hidden"></iframe>'); }