script lazy

window.onDo = (f) => {
	let loaded = false

	let d = () => {
		if (!loaded) {
			f()
			loaded = true

			window.removeEventListener('scroll', d, {passive: true})
			window.removeEventListener('touchstart', d)
			document.removeEventListener('mouseenter', d)
			document.removeEventListener('mousemove', d)
			document.removeEventListener('click', d)
		}
	}

	window.addEventListener('scroll', d, {passive: true})
	window.addEventListener('touchstart', d)
	document.addEventListener('mouseenter', d)
	document.addEventListener('mousemove', d)
	document.addEventListener('click', d)
}

window.appendScript = (src, inner = false) => {
	return new Promise(resolve => {
		let script = document.createElement('script')
		if (inner) {
			script.innerHTML = src
		} else {
			script.src = src
		}
		script.type = 'text/javascript'
		script.onload = () => resolve()
		document.body.appendChild(script)
	})
}

window.scriptLazy = (src, inner = false) => {
	return new Promise(resolve => {
		onDo(() => {
			appendScript(src, inner).then(() => {
				resolve()
			})
		})
	})
}