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jsclass.html
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jsclass.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>JS Class Extend and Event</title>
<script type="text/javascript">
// http://ejohn.org/blog/simple-javascript-inheritance/
var Class = (function(UNDEF) {
var initializing = false, regex = /xyz/.test(function() {
'xyz';
}) ? /\b_super\b/ : /.*/, fn = function() {
}, isFn = function(fn) {
return (typeof fn === 'function');
}, removeItem = function(array, item) {
for ( var i = 0, l = array.length; i < l; i++) {
if (array[i] === item) {
array.splice(i, 1);
i--;
}
}
}, getListener = function(obj, type, force) {
var allListeners = obj.__allListeners || force && (obj.__allListeners = {});
type = type.toLowerCase();
return allListeners && (allListeners[type] || force && (allListeners[type] = []));
}, extend = function(obj) {
var _super = this.prototype, proto, name, isOverwriting;
initializing = true;
proto = new this();
initializing = false;
for (name in obj) {
isOverwriting = isFn(obj[name]) && isFn(_super[name]) && regex.test(obj[name]);
proto[name] = isOverwriting ? (function(name, fn) {
return function() {
var tmp = this._super, ret;
this._super = _super[name];
ret = isFn(fn) ? fn.apply(this, arguments) : void (0);
this._super = tmp;
return ret;
};
})(name, obj[name]) : obj[name];
}
function Klass() {
if (!initializing && isFn(this.init)) {
this.init.apply(this, arguments);
}
}
Klass.prototype = proto;
Klass.constructor = Klass;
Klass.extend = arguments.callee;
return Klass;
}, Class = extend.call(fn, {
on : function(type, listener) {
getListener(this, type, true).push(listener);
},
un : function(type, listener) {
var listeners = getListener(this, type);
listeners && removeItem(listeners, listener);
},
fire : function(type) {
var listeners = getListener(this, type), r = null, t, k;
if (listeners) {
k = listeners.length;
while (k--) {
t = listeners[k].apply(this, arguments);
if (t !== UNDEF) {
r = t;
}
}
}
if (t = this['on' + type.toLowerCase()]) {
r = t.apply(this, arguments);
}
return r;
}
});
return Class;
})();
</script>
<script type="text/javascript">
var failCount = 0;
function startup() {
testExtend();
testEvent();
if (!failCount) {
alert('测试全部通过！');
}
}
function assert(desc, test) {
if (arguments.length === 1) {
test = desc;
}
if ('function' === typeof test) {
test = test() !== false;
}
if (!test) {
++failCount;
throw new Error("assertion failed: " + desc);
}
}
function testExtend() {
var Person = Class.extend({
init : function(isDancing) {
this.dancing = isDancing;
},
dance : function() {
return this.dancing;
}
});
var Nezha = Person.extend({
init : function() {
this._super(false);
},
dance : function() {
return this._super();
},
sing : function() {
return true;
}
});
var p = new Person(true);
assert('p的dancing应该为true', p.dance());
var n = new Nezha();
assert('n的dancing应该为false', !n.dance());
assert('n的sing()应该返回true', n.sing())
assert(p instanceof Person);
assert(p instanceof Class);
assert(n instanceof Nezha);
assert(n instanceof Person);
assert(n instanceof Class);
}
function testEvent() {
var Control = Class.extend({
init : function(container) {
this.container = container;
},
render : function() {
this.container.onclick = bind(this._proxyDomEvent, this);
this.fire('ready');
},
_proxyDomEvent : function(evt) {
evt = window.event || evt;
return this.fire(evt.type.replace(/^on/, ''), evt);
}
});
var elem = document.getElementById('test');
var control = new Control(elem);
var eventListener = function(type, evt) {
assert(type);
if (type === 'click') {
assert(evt);
}
alert('[' + type + '] event occurring!');
};
// 绑定监听
control.on('ready', eventListener); // 测试监听自定义事件
control.on('click', eventListener); // 测试监听DOM事件
// 触发事件
control.render();
invokeClick(elem); // 模拟DOM事件的触发
}
function bind(fn, context) {
return function() {
return fn.apply(context, arguments);
};
}
// 触发元素的点击事件
function invokeClick(element) {
if (element.click) { // IE 8,FireFox 12,Chrome 19
element.click();
} else if (element.fireEvent) {
element.fireEvent('onclick');
} else if (document.createEvent) { // Safari 5.1.2
var evt = document.createEvent('MouseEvents');
evt.initEvent('click', true, true);
element.dispatchEvent(evt);
}
}
</script>
</head>
<body onload="startup();">
<div id="test">Test pass in [IE 8, FireFox 12, Chrome 19, Safari 5].</div>
</body>
</html>