5:to do list

时间:2021-02-23 14:31:40   收藏:0   阅读:0

技术图片

 

 

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>to do list</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        body {
            padding: 100px;
        }
        textarea {
            width: 200px;
            height: 100px;
            border: 1px solid pink;
            outline: none;
            resize: none;
        }
        ul {
            margin-top: 50px;
        }
        li {
            width: 300px;
            padding: 5px;
            background-color: rgb(245, 209, 243);
            color: red;
            font-size: 14px;
            margin: 15px 0;
        }
    </style>
</head>
<body>
<textarea name="" id=""></textarea>
<button>按钮</button>
<ul>
</ul>
<script>
    var btn = document.querySelector(button);
    var text = document.querySelector(textarea);
    var ul = document.querySelector(ul);
    //给btn添加点击事件
    btn.onclick = function () {
        if (text.value == ‘‘) {
            alert(请输入内容);
            return false;
        } else {
            //1 创建元素
            var li = document.createElement(li);
            //2 把用户输入的内容 赋值给 li
            li.innerHTML = text.value;
            //3 添加入元素
            ul.insertBefore(li,ul.children[0]);
        }
    }
    //给text的添加焦点事件
    text.onfocus = function () {
        text.value = ‘‘;
    }
</script>
</body>
</html>

 

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