スマホの長押し禁止を解除・回避するJavaScriptコード

// ==UserScript==
// @name Anti-NoCopy
// @version 0.1.0
// @description
// ==/UserScript==
! function() {
var a = document,
b = ["userSelect", "khtmlUserSelect", "MozUserSelect", "MsUserSelect", "WebkitUserSelect"];
f = function() {
return true;
};
Array.prototype.forEach.call(a.all, function(a) {
a.style &&
b.forEach(function(b) {
a.style[b] = "auto"
}), a.onmousedown = a.onmousemove = a.onmouseup = a.onselectstart = ""
}), a.onmousedown = a.onmousemove = a.onmouseup = a.onselectstart = a.oncontextmenu = a.body.oncontextmenu = f;
obs = document.all;
for (i = 0; i < obs.length; i++) {
obs[i].oncontextmenu = 'return true;';
obs[i].onselectstart = 'return true;';
}
}();

>>1のコードが効かない場合

document.addEventListener('contextmenu',function(e){e.stopPropagation();},true);

◯右クリック、テキスト選択禁止を解除
javascript:(function(){
var d = document;
var select = ['userSelect','khtmlUserSelect','MozUserSelect','MsUserSelect','WebkitUserSelect'];
Array.prototype.forEach.call(d.all, function(el){
if(el.style) select.forEach(function(style){el.style[style] = 'auto';});
el.onmousedown = el.onmousemove = el.onmouseup = el.onselectstart = '';
});
d.onmousedown = d.onmousemove = d.onmouseup = d.onselectstart = d.oncontextmenu = d.body.oncontextmenu = '';
})()

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