页面打开后自动为数组添加方法（求和，最大值）并且输出

2016/12/13 85456
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<title>为数组添加方法（求和，最大值）</title>
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pre{color:green;padding:10px 15px;background:#f0f0f0;border:1px dotted #333;font:12px/1.5 Courier New;}
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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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代码片段
