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解除网页内容无法选择和右键屏蔽的限制

remove the limit of right key clicking and draging content to select

// ==UserScript==
// @name       解除网页内容无法选择和右键屏蔽的限制
// @namespace  https://greasyfork.org/users/3586-yechenyin
// @version    0.3
// @description  remove the limit of right key clicking and draging content to select
// @include      http://*
// @include      https://*
// @author     yechenyin
// ==/UserScript==

var body = document.getElementsByTagName('body')[0];
body.removeAttribute('oncontextmenu');
body.removeAttribute('onselectstart');
body.removeAttribute('ondragstart');
body.removeAttribute('onmousedown');