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<div id="panel"><div/>
document.getElementById("panel").innerHTML = "sdfsd";
function Element(value, domEL){
this.domEl = domEL;
this.domEl.getValue = function() { return value; };
this.domEl.setValue = function(newValue){
var isChange = false || value!=newValue;
value = newValue;
if(isChange && this.onValueChange) this.onValueChange();
};
this.domEl.buttonObj = this;
this.domEl.onValueChange=this.valueChangeHandler;
}
Element.prototype.valueChangeHandler=function(){
var buttonObj = this.buttonObj;
alert('value is changed to '+ buttonObj.domEl.getValue());
}
var b = new Element(1, document.getElementById("panel"));
var Element = function(obj){
this.element = obj;
return this;
}
Element.prototype.innerHTML = function(txt, callBack) {
var _arg = [];
var _len = arguments.length;
for(var i = 0; i < _len; i++) {
_arg[i] = arguments[i];
}
var _oldTxt = this.element.innerHTML;
this.element.innerHTML = _arg.shift();
_arg.shift();
callBack.apply(window, [_oldTxt, txt].concat(_arg));
}
var $Element = function(id) {
var _obj = (typeof(id) == 'string')? document.getElementById(id) : id;
return new Element(_obj);
}
function alertIt(oldTxt, newTxt, str) {
alert(str);
}
$Element('box').innerHTML('ddd', alertIt, '内容改变了!');