我使用jQuery extend函数来扩展类原型。
例如:
MyWidget = function(name_var) {
this.init(name_var);
}
$.extend(MyWidget.prototype, {
// object variables
widget_name: '',
init: function(widget_name) {
// do initialization here
this.widget_name = widget_name;
},
doSomething: function() {
// an example object method
alert('my name is '+this.widget_name);
}
});
// example of using the class built above
var widget1 = new MyWidget('widget one');
widget1.doSomething();
有没有更好的方法来做这件事?有没有一种更干净的方法来创建上面的类,只用一条语句而不是两条语句?
发布于 2008-09-17 16:01:17
我很喜欢John Resig的Simple JavaScript Inheritance。
var MyWidget = Class.extend({
init: function(widget_name){
this.widget_name = widget_name;
},
doSomething: function() {
alert('my name is ' + this.widget_name);
}
});
注:上面演示的"Class“对象不包含在jQuery本身中-它是jQuery先生自己的25行代码片段,在上面的文章中提供。
发布于 2012-12-23 09:30:28
为什么不在jQuery之前使用JavaScript本身provides...long的简单OOP呢?
var myClass = function(){};
myClass.prototype = {
some_property: null,
some_other_property: 0,
doSomething: function(msg) {
this.some_property = msg;
alert(this.some_property);
}
};
然后,您只需创建该类的一个实例:
var myClassObject = new myClass();
myClassObject.doSomething("Hello Worlds");
很简单!
发布于 2008-09-17 22:44:51
总结一下我到目前为止学到的东西:
下面是让Class.extend()在jQuery中工作的基本函数(由John Resig从Simple JavaScript Inheritance复制):
// Inspired by base2 and Prototype
(function(){
var initializing = false, fnTest = /xyz/.test(function(){xyz;}) ? /\b_super\b/ : /.*/;
// The base Class implementation (does nothing)
this.Class = function(){};
// Create a new Class that inherits from this class
Class.extend = function(prop) {
var _super = this.prototype;
// Instantiate a base class (but only create the instance,
// don't run the init constructor)
initializing = true;
var prototype = new this();
initializing = false;
// Copy the properties over onto the new prototype
for (var name in prop) {
// Check if we're overwriting an existing function
prototype[name] = typeof prop[name] == "function" &&
typeof _super[name] == "function" && fnTest.test(prop[name]) ?
(function(name, fn){
return function() {
var tmp = this._super;
// Add a new ._super() method that is the same method
// but on the super-class
this._super = _super[name];
// The method only need to be bound temporarily, so we
// remove it when we're done executing
var ret = fn.apply(this, arguments);
this._super = tmp;
return ret;
};
})(name, prop[name]) :
prop[name];
}
// The dummy class constructor
function Class() {
// All construction is actually done in the init method
if ( !initializing && this.init )
this.init.apply(this, arguments);
}
// Populate our constructed prototype object
Class.prototype = prototype;
// Enforce the constructor to be what we expect
Class.constructor = Class;
// And make this class extendable
Class.extend = arguments.callee;
return Class;
};
})();
一旦运行并执行了这段代码,就可以从insin's answer中执行以下代码:
var MyWidget = Class.extend({
init: function(widget_name){
this.widget_name = widget_name;
},
doSomething: function() {
alert('my name is ' + this.widget_name);
}
});
这是一个很好的、干净的解决方案。但是我很想看看是否有人有一个不需要向jquery添加任何东西的解决方案。
https://stackoverflow.com/questions/84716
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