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day1007-array.html
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<!doctype html>
<html lang="zh-Hans">
<head>
<meta charset="utf-8">
<meta name="keywords" content="JavaScript,数组,数组遍历">
<meta name="description" content="JavaScript 数据基础">
<title>JavaScript 数组基础</title>
<script>
// 看数组 观察变化找规律
// 每次都右移2位
var arr = ['a', 'b', 'c', 'd', 'e'];
console.log('初始', arr);
for (var i = 0; i < 15; i++) {
for (var shiftCnt = 0; shiftCnt < 2; shiftCnt++) {
var tail = arr[arr.length - 1];
for (var idx = arr.length - 2; idx >= 0; idx--) {
arr[idx + 1] = arr[idx];
}
arr[0] = tail;
}
console.log('第', i + 1, '次', arr);
}
// 抽丝剥茧
var arr = ['鸡腿', 101, '3', '奥利奥', 9, false, '33a', 1.333, '巧克力'];
var sum = 0;
for (var i of arr) {
if (typeof i === 'number' && i === parseInt(i)) {
sum += i;
}
}
console.log(arr, "中所有类型为number的整数之和为", sum);
</script>
</head>
<body>
</body>
</html>