Select-click-copy Enabler

Enables select, right-click, copy and drag on pages that disable them. WARNING: MAY BREAK PAGE FUNCTIONS.
换行
// ==UserScript==
// @name         Select-click-copy Enabler
// @namespace    Coding With KR
// @version      0.1
// @description  Enables select, right-click, copy and drag on pages that disable them. WARNING: MAY BREAK PAGE FUNCTIONS.
// @match       http://*/*
// @match       https://*/*
// @author       KR Bishnoi
// @license      GPL version 2 or any later version; http://www.gnu.org/licenses/gpl-2.0.txt
// @grant        none
// @run-at       document-start
// ==/UserScript==

var wasRun
//increase this value to 1000 or greater for pages that need a long time to be loaded
var BODY_DELAY = 100

function init() {

	 wasRun = false

}

function enableSelectClickCopy() {

	var events =
		['copy', 'mouseup', 'mousedown', 'contextmenu', 'select', 'selectstart', 'dragstart']
	var topElements = [window, document]

	function disableAll(event) {
		if (event.stopImmediatePropagation) {
			event.stopImmediatePropagation()
		}
		else if (event.stopPropagation) {
			event.stopPropagation()
		}
	}

	for (var i = 0; i < events.length; i++) {
		var event = 'on' + events[i]
		for (var j = 0; j < topElements.length; j++) {
			topElements[j][event] = null
		}
		document.addEventListener(events[i], disableAll, true)
	}

}

function loadedHandler() {

	if (wasRun) {
		return
	}
	wasRun = true
	document.removeEventListener('beforescriptexecute', loadedHandler, true)
	document.removeEventListener('beforeload', loadedHandler, true)
	document.removeEventListener('DOMContentLoaded', loadedHandler, true)
	appendScript(document)

}

function loadedCssIframeHandler() {

	setTimeout(function() {
		appendCssEnabler(document.body)
		//handle iframes
		var oldBody, newBody
		for (var i = 0; i < frames.length; i++) {
			var iDocument
			try {
				iDocument = frames[i].document
			}
			//cross domain access, protocol mismatch, etc
			catch(securityError) {
				continue
			}

			if(iDocument) {
				oldBody = iDocument.body
				newBody = oldBody.cloneNode(true)
				prependScriptTo(newBody)
				appendCssEnabler(newBody)
				oldBody.parentNode.replaceChild(newBody, oldBody)
			}

		}
	}, BODY_DELAY)

}

function appendScript(documentObject) {

	if(!documentObject) {
		return
	}
	var s = documentObject.createElement('script')
	s.innerHTML = '(' + enableSelectClickCopy.toString() + ')()'
	var container = documentObject.head || documentObject.body
	if(container) {
		container.appendChild(s)
	}

}

function prependScriptTo(container) {

	if(!container) {
		return
	}
	var s = document.createElement('script')
	s.innerHTML = '(' + enableSelectClickCopy.toString() + ')()'
	container.insertBefore(s, container.firstChild)

}

function appendCssEnabler(container) {

	var css = document.createElement('style')
	css.type = 'text/css'
	css.innerHTML =
		'* {-webkit-touch-callout: text !important; -webkit-user-select: text !important; ' +
		'-khtml-user-select: text !important; -moz-user-select: text !important; ' +
		'-ms-user-select: text !important; user-select: text !important;}'
	if(container) {
		container.appendChild(css)
	}

}

init()

if ('onbeforescriptexecute' in document) {
	//for firefox
	document.addEventListener('beforescriptexecute', loadedHandler, true)
}
else {
	//for chrome and opera
	document.addEventListener('beforeload', loadedHandler, true)
}

document.addEventListener('DOMContentLoaded', function() {
	//in case all previous efforts fail
	loadedHandler()
	//handle css and iframes
	loadedCssIframeHandler()
}, true)
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