<script>

//1.获取数组长度，数组元素个数，数组下标最大值加一

var data1 = new Array(123,456,789);

var str   = new Array('a','b','','','f','g');

console.log(data1.length);

console.log(str.length);

var arr = [];

arr.length = 5;

console.log(arr.length);

var arr1 = new Array(4);

console.log(arr1.length);

</script>

<script>

//2.数组的访问

var score = ["HTML5","CSS3","JS","jQuery","MUI"];

console.log(score[1]);

console.log(score[3]);

console.log(score);

for(var i  in score){

console.log(score[i]);

}

</script>

<script>

//3.元素的添加与修改

var height = [];

height[0] = 183;

height[1] = 172;

height[4] = 180;

console.log(height);

var arr2 = ['张三','李四'];

arr2[2] = "王五";

arr2[3] = "赵六";

console.log(arr2);

//元素修改

arr2[2] = 'tom';

arr2[3] = 'jack';

console.log(arr2);

</script>

<script>

//元素删除

var arr3 = ['a','b','c','d','e'];

console.log(arr3);

delete arr3[1];

console.log(arr3);

arr3.length = 4;

console.log(arr3);

//元素清空

arr3.length = 0;

console.log(arr3);

//元素清空

arr3 = [];

console.log(arr3);

</script>

<script>

//查找元素的最大值与最小值

var arr = [100,7,65,54,12,6];

var min = max = arr[0];

for (var i =1;i<arr.length;i++)

{

if(arr[i]<min){ min = arr[i];}

if(arr[i]>max){ max = arr[i];}

}

//输出数组

console.log("待查找数组:"+arr);

//输出最小值

console.log("数组最小值:"+min);

//输出最大值

console.log("数组最大值:"+max);

</script>