js里如何从数组中获取值

Question

js里如何从数组中获取值

Answer 1

先用typeof判断类型，然后parseFloat转换，判断结构是否NaN。JS获取数组最大值、最小值及长度的方法：最小值：Array.prototype.min = function() {var min = this[0];var len = this.length;for (var i = 1; i < len; i++){if (this[i] < min){min = this[i];}}return min;}最大值：Array.prototype.max = function() {var max = this[0];var len = this.length;for (var i = 1; i < len; i++){if (this[i] > max) {max = this[i];}}return max;}数组长度：var array = new array(1,2,3,2,4,55,2);alert(array.length);//输出7

Answer 2

操作数组的方式所有语言都是一样的。var arr = [1,2,3,4,5];alert(arr[0]);

Answer 3

你是想实现一个数组赋值给另一个数组吗？例如：<script type="text/javascript">var newA=Array(a,b,c,d);var oldA=new Array();for(var i=0;i<new.lenght;i++){oldA[i]=newA[i];}</script>