js题
2018-07-24 本文已影响18人
年丶轮
1、
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<script>
var myarr =[1,2,3,4];
var item = 3;
for (var i = 0;i<=4;i++){
if (item == myarr[i]){
item += 1
}
else item = -1
document.write("item");
}
</script>
</body>
</html>
2、
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<script>
var arr = [1,2,3,4];
var sum = 0;
for (var i=0;i<=3;i++){
sum += arr[i];
}
document.write(sum);
</script>
</body>
</html>
3、
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<script>
var arr = [1,2,3,4,2];
var item = 2;
for (var i=0;i<=4;i++){
if (item === arr[i]){
var arr1 = new Array();
arr1[i] = arr[i];
}
}
document.write(arr1);
</script>
</body>
</html>
4、
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<script>
var arr = [1,2,3,4,2];
var item = 2;
for (var i=0;i<=4;i++){
if (arr[i] === item){
arr.splice(i,1)
}
}
document.write(arr)
</script>
</body>
</html>
