如何计算数组中元素的总和和平均值？

Question

我在添加数组的所有元素以及将它们取平均值时遇到了问题。我该怎么做并用我现在拥有的代码实现它？这些元素应该定义如下。

<script type="text/javascript">

//<![CDATA[

var i;

var elmt = new Array();

elmt[0] = "0";

elmt[1] = "1";

elmt[2] = "2";

elmt[3] = "3";

elmt[4] = "4";

elmt[5] = "7";

elmt[6] = "8";

elmt[7] = "9";

elmt[8] = "10";

elmt[9] = "11";

// Problem here

for (i = 9; i < 10; i++){

  document.write("The sum of all the elements is: " + /* Problem here */ + " The average of all the elements is: " + /* Problem here */ + "<br/>");

}   

//]]>

</script>

Answer 1

var sum = 0;for( var i = 0; i < elmt.length; i++ ){&nbsp; &nbsp; sum += parseInt( elmt[i], 10 ); //don't forget to add the base}var avg = sum/elmt.length;document.write( "The sum of all the elements is: " + sum + " The average is: " + avg );只需遍历数组，因为您的值是字符串，因此必须先将它们转换为整数。平均值就是值的总和除以值的数量。