页面打开后自动为数组添加方法(求和,最大值)并且输出

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<title>为数组添加方法(求和,最大值)</title>
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<script type="text/javascript">
<span>//求和</span>
Array.prototype.sum = function ()
{
	for (var sum = i = 0; i < this.length; i++)sum += parseInt(this[i]);
	return sum
};
<span>//求最大值</span>
Array.prototype.maxima = function ()
{
	for (var i = 0, maxValue = Number.MIN_VALUE; i < this.length; i++)parseInt(this[i]) > maxValue && (maxValue = this[i]);
	return maxValue
};
<span>//应用</span>
var arr = [1,21,3,4,22,45,6,7,32];
alert(arr.join("+") + "=" + arr.sum());<span> //和:141</span>
alert(arr.join("|") + "中, 最大的数是:" + arr.maxima());<span> //最大数:45</span>
</script>
</pre>
<script type="text/javascript">
//求和
Array.prototype.sum = function ()
{
	for (var sum = i = 0; i < this.length; i++)sum += parseInt(this[i]);
	return sum
};
//求最大值
Array.prototype.maxima = function ()
{
	for (var i = 0, maxValue = Number.MIN_VALUE; i < this.length; i++)parseInt(this[i]) > maxValue && (maxValue = this[i]);
	return maxValue
};
//应用
var arr = [1,21,3,4,22,45,6,7,32];
alert(arr.join("+") + "=" + arr.sum());
alert(arr.join("|") + "中, 最大的数是:" + arr.maxima());
</script>
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编程技巧