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JavaScriptに於ける闇の魔術と闇の魔術に対する防衛術

Last updated at Posted at 2020-03-25

prototypeはね...死人がでるよね。

闇の魔術

自分のPCに閉じ込めておく分には、まぁ楽で良いんだけれども。

俗に言う黒魔術
const __BASE_PROTO = {
	$: {
		value (...child) {
			// 略
			return this;
		} 
	}
}
{
	Object.defineProperties(Node.prototype, __BASE_PROTO);
	Object.defineProperties(Element.prototype, __BASE_PROTO);

}
function GOD(v) {
	this.v = v;
	// 略
};
Object.assign(GOD.prototype, Object.prototype, Array.prototype, Number.prototype, String.prototype);

ただ、後で面倒になる。

闇の魔術に対する防衛術

参考にしたライブラリはある $(dsand).$()
で、自分はこの防衛術をつかって SVGをグリグリ書いて、うりうり動かすライブラリを書いている svg.js

俗に言う白魔術
const __BASE_PROTO__ = {
	// '@': elem,
	'@parse' : {
		value (arr) {return arr.filter(v => null != v).map(v => '@' in v ? v['@'] : v)}
	},
	_ : {
		value () {return this['@'];},
	},
	has: {
		value (prop) {return prop in this["@"];}
	},
	$: {
		value(...child) {
			// 略
			return this;
		},
	},
	// 略
}
const _ = function(el, custom = '') {
	return Object.create(
		{ '@': el },
		custom instanceof Object
			? Object.assign({}, __BASE_PROTO__, custom)
			: __BASE_PROTO__);
};
const _tag = tag => document.createElement(tag);
const div = () => _(_tag('div'));
const p = () => _(_tag('p'));
<!DOCTYPE html>
<html>
<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>foo</title>
	<script src="_.js"></script>
	<script>
	const load = () => {
		_(document.body).$(
			div().$(
				p().$('hello')
			),
			div().$(
				p().$('world')
			)
		);
	};
	document.addEventListener("DOMContentLoaded", load);
	</script>
</head>
<body>
</body>
</html>
bodyに追加される
<div><p>hello</p></div>
<div><p>world</p></div>
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