JS中数组实现代码(倒序遍历数组,数组连接字符串)

Js中的数组是一种特殊的对象，用来表示偏移量的索引是该对象的属性。

具体代码如下所示：

// =================== 求最大值=====================================
<script>
var arr = [10,35,765,21345,678,89];

var max = arr [0];

for (var i=0;i< arr.length;i++) {


if (max<arr[i]){



max = arr [i];


}

}

console.log("最大值:" + max);
</script>
// =================== 求最小值=====================================
<script>

var arr = [10,35,765,21345,678,89];

var max = arr [0];

for (var i=0;i< arr.length;i++) {


if (max>arr[i]){



max = arr [i];


}

}

console.log("最小值:" + max);
</script>
// ============================倒序遍历数组===============================
<script>

var arr = [1,2,3,4,5,6,7,8,9];

for (var i= arr.length-1;i>=0;i--){


console.log(arr[i]);

}
</script>
//===========数组拼接字符串===========第一种方法（从前面往后加）=========
<script>

var names = ["周杰伦","李连杰","林俊杰","张韶涵","田馥甄"];

var str = "";


for (var i = 0; i< names.length-1;i++){



str += names[i] + "|"


}


console.log(str+ names[names.length-1]);
</script>
//===========数组拼接字符串===========第二种方法（从后面往前加）=========
<script>

var names = ["周杰伦","李连杰","林俊杰","张韶涵","田馥甄"];

var str = "";

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


str += "|" + names[i]

}

console.log(names[0]+ str);
</script>
 

// ==============去掉数组中重复的0，把其他的数据放在一个数组中============
<script>

var arr = [10,20,0,12,0,0,124,32];

var newArr = [];

for (var i=0; i<arr.length; i++){


if (arr[i] != 0){


newArr[newArr.length] = arr[i];


}

}

console.log(newArr);
</script>
// =====================反转数组----------把数组中的数据位置调换=============
<script>

var array = [10,20,30,40,50,60];

for (var i=0 ;i<=array.length/2;i++){


var temp = array [i];


array[i] = array[array.length-1-i];


array[array.length-1-i] = temp;

}

console.log(array);
</script>
//===========数列求成绩，总成绩，平均分，最大最小值===============//

<script>

var proInput = parseInt(prompt("请输入计研17的班级人数"));

var proScore = [];

for (var i = 0; i< proInput; i++){


proScore[proScore.length] = parseInt(prompt("请输入第"+ (i+1) + "个同学的成绩"));

}

console.log(proScore);

var sum =0;

var aver = 0;

var max = proScore[0];

var min = proScore[0];

for (var i = 0;i< proScore.length;i++){


sum += proScore[i];


aver = sum/proScore.length;


if (max<proScore[i]){



max = proScore[i];


}


if (min>proScore[i]){



min = proScore[i];


}

}

console.log("班级总成绩:"+ sum);

console.log("平均值:"+ aver);

console.log("最大值:"+ max);

console.log("最小值:"+ min);
</script>

总结

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