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From:http://bbs.51js.com/thread-66469-1-1.html
复制代码 代码如下:
<script>
function ArrayList()
{
var ins = Array.apply(this, arguments);
ins.constructor = arguments.callee;
ins.base = Array;
ins.each = function(closure)
{
if(typeof closure == 'undefined')
closure = function(x){return x};
if(typeof closure != 'function')
{
var c = closure;
closure = function(x){return x == c}
}
var ret = new ArrayList();
var args = Array.apply(this, arguments).slice(1);
for(var i = 0; i < this.length; i++)
{
var rval = closure.apply(this, [this[i]].concat(args).concat(i))
if(rval || rval === 0)
ret.push(rval);
}
return ret;
}
ins.trim = function()
{
return this.each.apply(this);
}
ins.all = function(closure)
{
return this.each.apply(this, arguments).length == this.length;
}
ins.any = function(closure)
{
return this.each.apply(this, arguments).length > 0;
}
ins.contains = function(el)
{
return this.any(function(x){return x == el});
}
ins.indexOf = function(el)
{
var ret = this.each.call(this, function(x, i){return el == x?i:false})[0];
return ret ? ret : -1;
}
ins.subarr = function(start, end)
{
end = end || Math.Infinity;
return this.each.call(this, function(x, i){return i >= start && i < end ? x : null});
}
ins.valueOf = ins.toString;
ins.toString = function()
{
return '['+this.valueOf()+']';
}
ins.map = function(list, closure)
{
if (typeof list == 'function' && typeof closure != 'function')
{
var li = closure;
closure = list;
list = li;
}
closure = closure || ArrayList;
return this.each.call(this, function(x, i){return closure.call(this, x, list[i])});
};
ins.slice = function()
{
return this.constructor(ins.base.prototype.slice.apply(this, arguments));
}
ins.splice = function()
{
return this.constructor(ins.base.prototype.splice.apply(this, arguments));
}
ins.concat = function()
{
return this.constructor(ins.base.prototype.concat.apply(this, arguments));
}
return ins;
}
var a = new ArrayList(1,2,3);
alert(a.length);
alert(a);
alert(a instanceof Array);
alert(a.constructor);
alert(a instanceof ArrayList); // 可惜这个值不对，但是没法实现，只好放弃了
alert(a.each(function(x){return x+x}));
alert(a.all(function(x){return x>0}));
alert(a.all(function(x){return x<1}));
alert(a.any(function(x){return x == 2}));
alert(a.contains(2));
alert(a.contains(-1));
var b = a.map([3,2], function(x, y){return x+y});
alert(b);
alert(a.map([2,3,4]));
alert(a.indexOf(2));
alert(a.indexOf(-1));
alert(a.subarr(1,3));
alert(a.toString());
var b = new ArrayList(a,a);
alert(b.toString());
alert(b.slice(1));
</script>
arr.all 是当数组（集合）中的所有元素都满足条件时，返回true，否则返回false
arr.any 是当数组（集合）中的所有元素中任意一个满足条件时，返回true，如果都不满足，返回false
arr.each 返回由符合条件的每一个元素构成的子数组
arr.map 是匹配两个数组（集合）并把它们的元素用指定闭包进行计算
JavaScript技术：ArrayList类（增强版），转载需保留来源！
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