JS(二)

对象里面的属性和方法比较多啊,不容易记住,需要多实践:

1.将一串字符串的顺序颠倒,并实现首尾字母大写的两种方法:

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>关于字符串翻转的理解</title>

</head>

<body>

<script type="text/javascript">

/*var str = window.prompt("请输入你的字符串,么么哒!");

var length = str.length;

var m,n;

for(var i = length-1; i>=0; i--){

    if(i==length-1 || i==0){

        m = str.charAt(i);

        m = m.toUpperCase();

        document.write(m);

    }else{

        document.write(str.charAt(i));     //直接对字符串进行操作

    }

}*/

var str = window.prompt("Darling,please input your string!");

var arr = str.split("");

var length = arr.length;

arr[0] = arr[0].toUpperCase();

arr[length-1] = arr[length-1].toUpperCase();

arr = arr.reverse();

str = arr.join("");

document.write(str);                      //将字符串转换成数组进行操作,在转成字符串

</script>

</body>

</html>

2.获取邮箱用户名和域名的函数:

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>获取邮箱的域名函数</title>

</head>

<body>

<script type="text/javascript">

var str = window.prompt("Buddy,please input your email!");

function getEmail(email){

    var a = email.indexOf("@");

    var username = email.substring(0,a);

    var address = email.substr(a+1);

    return(document.write("用户名:"+username+";<br>域名:"+address+"."));

}

getEmail(str);

</script>

</body>

</html>

相关文章