js的prototype的例子一

<script>
Array.prototype.max = function()
{
var i, max = this[0];
for (i = 1; i < this.length; i++)
{
if (max < this[i])
max = this[i];
}
return max;
};
var dd = new Array(1, 2, 3, 4, 5, 6);
var y = dd.max();
alert(y);
</script>
返回6