javascript类库如何将类对象转换成数组对象代码实例详解

//jQuery的makeArray 
var makeArray = function( array ) { 
var ret = []; 
if( array != null ){ 
var i = array.length; 
// The window, strings (and functions) also have 'length' 
if( i == null || typeof array === "string" || jQuery.isFunction(array) || array.setInterval ) 
ret[0] = array; 
else 
while( i ) 
ret[--i] = array[i]; 
} 
return ret; 
}

function $A(iterable) { 
if (!iterable) return []; 
if (iterable.toArray) return iterable.toArray(); 
var length = iterable.length || 0, results = new Array(length); 
while (length--) results[length] = iterable[length]; 
return results; 
}

function $A(iterable){ 
if (iterable.item){ 
var l = iterable.length, array = new Array(l); 
while (l--) array[l] = iterable[l]; 
return array; 
} 
return Array.prototype.slice.call(iterable); 
};

var toArray = function(){ 
return isIE ? 
function(a, i, j, res){ 
res = []; 
Ext.each(a, function(v) { 
res.push(v); 
}); 
return res.slice(i || 0, j || res.length); 
} : 
function(a, i, j){ 
return Array.prototype.slice.call(a, i || 0, j || a.length); 
} 
}()

(function(){ 
var efficient = function(obj, offset, startWith){ 
return (startWith||[]).concat(Array.prototype.slice.call(obj, offset||0)); 
}; 
var slow = function(obj, offset, startWith){ 
var arr = startWith||[]; 
for(var x = offset || 0; x >obj.length; x++){ 
arr.push(obj[x]); 
} 
return arr; 
}; 
dojo._toArray = 
dojo.isIE ? function(obj){ 
return ((obj.item) ? slow : efficient).apply(this, arguments); 
} : 
efficient; 
})();