利用原生js的Dom操作实现简单的ToDoList的效果

  效果如下:

利用原生js的Dom操作实现简单的ToDoList的效果

  前端及js代码如下:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>ToDOList</title>
    <link rel="stylesheet" href="todolist.css">
</head>
<body style="background-color: #b0b0b0;margin: 0 auto;">
    <div class="pg-top">
        <label id="l1">ToDoList</label>
        <input id="i1" type="text" placeholder="请输入待办项目"  />
        <input id="i2" type="button" value="确定">
    </div>

    <div class="pg-body">
        <div class="body-middle">
            <div>
                <div>
                    <h2 style="color: yellowgreen">未完成</h2>
                </div>
                <div>
                    <ul id="u1">

                    </ul>
                </div>

            </div>

            <div>
                 <div>
                    <h2 style="color: greenyellow">已完成</h2>
                </div>
                <div>
                    <ul id="u2">

                    </ul>
                </div>
            </div>

        <div class="middle-bottom">
            <button value="清除全部" onclick="clear_all()" >清除全部</button>
        </div>
        </div>
    </div>

    <script>
        flag = false;
        //取值
        var msg = document.getElementById('i1');
        //点击确定的操作
            var sure = document.getElementById('i2');
            sure.onclick = function () {
                //先判断输入不能为空
                if(msg.value === ''){
                    alert('输入不能为空');
                    return
                }
                ul1 = document.getElementById('u1');
                ul2 = document.getElementById('u2');
                //新建一个li
                var li = document.createElement('li');
                //往li里添加内容--innerHTML
                li.innerHTML = '<label>' + msg.value + '</label>' + '<span><button class="b1">删除</button>&nbsp;&nbsp;&nbsp;<button class="b2">完成</button></span>';
                //判断后加入到ul1里面去
                var lis = document.getElementsByTagName('li');
                ul1.appendChild(li);
                //输入完后将输入框的内容清空
                msg.value = '';

                //点击删除对button b1 进行操作~~
                //var as =  document.getElementsByTagName('a');
                var as = document.getElementsByClassName('b1');
                for (var i = 0; i < as.length; i++) {
                    as[i].onclick = function () {
                        //this代表as[i]

                        //判断是哪个ul下的再进行删除操作
                        if (this.parentNode.parentNode.parentNode === ul1) {
                            ul1.removeChild(this.parentNode.parentNode);
                        }
                        else {
                            ul2.removeChild(this.parentNode.parentNode);
                        }
                    }
                }

                //点击完成对button b2 进行操作~
                var as1 = document.getElementsByClassName('b2');
                for (var j = 0; j < as.length; j++) {
                    as1[j].onclick = function () {
                        //将完成的li 添加到ul2中
                        li_u2 = this.parentNode.parentNode;

                        //console.log(li_u2.firstChild);
                        //console.log(li_u2.lastChild.firstChild);
                        //console.log(li_u2.lastChild.firstChild.nextSibling);
                        //console.log(li_u2.lastChild.lastChild);

                        //删除完成那个按钮
                        ll = li_u2.lastChild.lastChild;
                        li_u2.lastChild.removeChild(ll);
                        ul2.appendChild(li_u2);
                    }
                }

            };

        function clear_all() {
            var uu1 = document.getElementById('u1');
            var uu2 = document.getElementById('u2');
            uu1.innerHTML = '';
            uu2.innerHTML = '';
        }

    </script>

</body>
</html>

前端+js

  css效果如下:

*{
    margin:0;
    padding: 0;
}

button{
    cursor: pointer;
}

label{
    display: block;
}

ul{
    list-style-type: none;
}

.pg-top{
    height:55px;
    width:100%;
    position: fixed;
    color: white;
    background-color: #1d3cb0;
    line-height:55px;
    /*margin-top: -59px;*/
}

.pg-body{
    position: relative;
    width:100%;
}

.body-middle{
    position: absolute;
    left:22%;
    right:22%;
    margin-top:57px;
    width:56%;
    margin-left: auto;
    margin-right: auto;
    background-color: #2b84da;
}

.middle-bottom{
    text-align: center;

}

#l1{
    position: fixed;
    left: 35%;
}

#i1 {
    position: fixed;
    left:40%;
    top:16px;
    width:355px;
    height:19px;
}

#i2 {
    position: fixed;
    left:64%;
    top:16px;
    cursor: pointer;
}

css

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