Discuss
/
JavaScript
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写写
写写
Topic sourcefor (var i = 0; i < 3; i++) {
alert(arr[i]);
}
for (var i = 2; i >= 0; i--) {
alert(arr[i]);
}
- 写错了不能修改比较不开心
- 看到别人写的比我好,我重新修改下
var arr = ['Bart', 'Lisa', 'Adam'];
for (var i = 0; i < arr.length; i++) {
console.log(arr[i]);
}
var arr = ['Bart', 'Lisa', 'Adam'];
for (var i = arr.length; i >= 0; i--) {
console.log(arr[i]);
}
- 没看清题目,还得重来
var arr = ['Bart', 'Lisa', 'Adam'];
for (var i = 0; i < arr.length; i++) {
console.log("Hello," + arr[i] + "!");
}
var arr = ['Bart', 'Lisa', 'Adam'];
for (var i = arr.length; i >= 0; i--) {
console.log("Hello," + arr[i] + "!");
}
- 用while来写,注意下空格
正序
var arr = ['Bart', 'Lisa', 'Adam'];
var i = 0;
while(i < arr.length) {
alert("Hello," + " " + arr[i] + "!");
i++;
}
Reverse
'use strict';
var arr = ['Bart', 'Lisa', 'Adam'];
var i = arr.length - 1;
while(i < arr.length && i >= 0) {
alert("Hello," + " " + arr[i]) + "!";
i--;
}
- 1
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