淺談javascript的原型繼承

請看源碼： 複製代碼 代碼如下:function clone(o) {
var F = function(){};
F.prototype = o;
return new F();
}

首先看ext（4.1的1896行開始）的原型式繼承。 複製代碼 代碼如下:var TemplateClass = function(){};
var ExtObject = Ext.Object = {
chain: function (object) {
TemplateClass.prototype = object;
var result = new TemplateClass();
TemplateClass.prototype = null;
return result;
}
}

這裡清除了object的prototype。
再看一下jquery是怎麼玩的繼承。 複製代碼 代碼如下:var jQuery = function( selector, context ) {
return new jQuery.fn.init( selector, context, rootjQuery );
};
-----------------------
jQuery.fn = jQuery.prototype = {
constructor: jQuery,
init: function( selector, context, rootjQuery ) {
-----------------------
}
}
-------------------
jQuery.fn.init.prototype = jQuery.fn;

jquery玩的就比較高，藉助jQuery.fn.init來完成，但是思路一樣。
司徒正美的mass裡也有類似的繼承，在lang_fix.js裡面第17行： 複製代碼 代碼如下:create: function(o){
if (arguments.length > 1) {
$.log(" Object.create implementation only accepts the first parameter.")
}
function F() {}
F.prototype = o;
return new F();
}

查看了一下es5的官方，找到了他的相容補丁： 複製代碼 代碼如下:// ES5 15.2.3.5
// http://es5.github.com/#x15.2.3.5
if (!Object.create) {
Object.create = function create(prototype, properties) {
var object;
if (prototype === null) {
object = { "__proto__": null };
} else {
if (typeof prototype != "object") {
throw new TypeError("typeof prototype["+(typeof prototype)+"] != 'object'");
}
var Type = function () {};
Type.prototype = prototype;
object = new Type();
// IE has no built-in implementation of `Object.getPrototypeOf`
// neither `__proto__`, but this manually setting `__proto__` will
// guarantee that `Object.getPrototypeOf` will work as expected with
// objects created using `Object.create`
object.__proto__ = prototype;
}
if (properties !== void 0) {
Object.defineProperties(object, properties);
}
return object;
};
}

上面的代碼考慮的就比較全面，但是需要另外引入Object.defineProperties的補丁才行，源碼相對就比較多了。 複製代碼 代碼如下:// ES5 15.2.3.6
// http://es5.github.com/#x15.2.3.6
// Patch for WebKit and IE8 standard mode
// Designed by hax <hax.github.com>
// related issue: https://github.com/kriskowal/es5-shim/issues#issue/5
// IE8 Reference:
// http://msdn.microsoft.com/en-us/library/dd282900.aspx
// http://msdn.microsoft.com/en-us/library/dd229916.aspx
// WebKit Bugs:
// https://bugs.webkit.org/show_bug.cgi?id=36423
function doesDefinePropertyWork(object) {
try {
Object.defineProperty(object, "sentinel", {});
return "sentinel" in object;
} catch (exception) {
// returns falsy
}
}
// check whether defineProperty works if it's given. Otherwise,
// shim partially.
if (Object.defineProperty) {
var definePropertyWorksOnObject = doesDefinePropertyWork({});
var definePropertyWorksOnDom = typeof document == "undefined" ||
doesDefinePropertyWork(document.createElement("div"));
if (!definePropertyWorksOnObject || !definePropertyWorksOnDom) {
var definePropertyFallback = Object.defineProperty;
}
}
if (!Object.defineProperty || definePropertyFallback) {
var ERR_NON_OBJECT_DESCRIPTOR = "Property description must be an object: ";
var ERR_NON_OBJECT_TARGET = "Object.defineProperty called on non-object: "
var ERR_ACCESSORS_NOT_SUPPORTED = "getters & setters can not be defined " +
"on this javascript engine";
Object.defineProperty = function defineProperty(object, property, descriptor) {
if ((typeof object != "object" && typeof object != "function") || object === null) {
throw new TypeError(ERR_NON_OBJECT_TARGET + object);
}
if ((typeof descriptor != "object" && typeof descriptor != "function") || descriptor === null) {
throw new TypeError(ERR_NON_OBJECT_DESCRIPTOR + descriptor);
}
// make a valiant attempt to use the real defineProperty
// for I8's DOM elements.
if (definePropertyFallback) {
try {
return definePropertyFallback.call(Object, object, property, descriptor);
} catch (exception) {
// try the shim if the real one doesn't work
}
}
// If it's a data property.
if (owns(descriptor, "value")) {
// fail silently if "writable", "enumerable", or "configurable"
// are requested but not supported
/*
// alternate approach:
if ( // can't implement these features; allow false but not true
!(owns(descriptor, "writable") ? descriptor.writable : true) ||
!(owns(descriptor, "enumerable") ? descriptor.enumerable : true) ||
!(owns(descriptor, "configurable") ? descriptor.configurable : true)
)
throw new RangeError(
"This implementation of Object.defineProperty does not " +
"support configurable, enumerable, or writable."
);
*/
if (supportsAccessors && (lookupGetter(object, property) ||
lookupSetter(object, property)))
{
// As accessors are supported only on engines implementing
// `__proto__` we can safely override `__proto__` while defining
// a property to make sure that we don't hit an inherited
// accessor.
var prototype = object.__proto__;
object.__proto__ = prototypeOfObject;
// Deleting a property anyway since getter / setter may be
// defined on object itself.
delete object[property];
object[property] = descriptor.value;
// Setting original `__proto__` back now.
object.__proto__ = prototype;
} else {
object[property] = descriptor.value;
}
} else {
if (!supportsAccessors) {
throw new TypeError(ERR_ACCESSORS_NOT_SUPPORTED);
}
// If we got that far then getters and setters can be defined !!
if (owns(descriptor, "get")) {
defineGetter(object, property, descriptor.get);
}
if (owns(descriptor, "set")) {
defineSetter(object, property, descriptor.set);
}
}
return object;
};
}
// ES5 15.2.3.7
// http://es5.github.com/#x15.2.3.7
if (!Object.defineProperties) {
Object.defineProperties = function defineProperties(object, properties) {
for (var property in properties) {
if (owns(properties, property) && property != "__proto__") {
Object.defineProperty(object, property, properties[property]);
}
}
return object;
};
}

EcmaScript6的類繼承。 複製代碼 代碼如下:class module extends Base {
constructor() {
}
}

越玩越像java了，不過es6很多瀏覽器還不支援。
最後推薦的寫法： 複製代碼 代碼如下:if (!Object.create) {
Object.create = function create(o) {
var F = function(){};
F.prototype = o;
var result = new F();
F.prototype = null;
return result;
}
}