JS中数组的实现(逆序遍历数组,将数组连接到字符串)
// =================== 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>
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