<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8" />
<title></title>
</head>
<body>
<script type="text/javascript">
// -> 基本类型：数字类型number、布尔类型boolean、字符串类型string
//-> 引用类型：对象类型、函数类型
//-> 空类型：null和undefined
//-> 运算符：typeof
var sum = 0;
for (var i = 1; i < 100; i++) {
sum += i;
}
//遍历数组
var arr = [1, "ab", "ob", 90];
alert(typeof arr);
for (var i in arr) {
console.log(arr[i]);
}
//键值对
var keys = {
"a": "张飞",
"b": "关羽"
};
for (var i in keys) {
console.log(keys[i]);
}
//水仙花数
for (var i = 100; i < 1000; i++) {
var gsum = i % 10;
var ssum = parseInt(i / 10) % 10;
var bsum = parseInt(i / 100);
if (i==(Math.pow(gsum,3)+Math.pow(ssum,3)+Math.pow(bsum,3)) ){
console.log(i);
}
}
//alert(sum)
//打印到控制台 适合调试
// alert(typeof "aaa");
console.log("Hello world");
</script>
</body>
</html>
