demo ‘todolist’项目开发

todolist-site-----------主文件夹
　　css------------css文件文件夹
　　　　header.css---主页面头部样式css
       section.css---主页面内容样式css
       footer.css---主页面尾部样式css
　　　　reset.css---清除默认样式css
　　js-------------js文件文件夹
　　　　index.js---js脚本文件
　　index.html-----启动程序
    

本项目参考了http://www.todolist.cn/点击打开链接，对代码进行了一些精简，并添加了一些功能。在实现项目的过程中，首先是实现最基本的功能，然后不断地添加增强功能和美化。

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参考链接http://www.todolist.cn/   1.将用户输入添加至待办项   2.可以对todolist进行分类（待办项和已完成组），用户勾选既将待办项分入已完成组   3.todolist的每一项可删除和编辑   4.下方有clear按钮，并清空所有todolist项

　　

header.css

/*背景*/
body{
    background-color: #cdcdcd;
    font-size: 16px;
}
/*头部*/
.header{
    height: 50px;
    background-color: #333;
}
.header .section h3{
    float: left;
    color: #ddd;
    font-size: 24px;
    line-height: 50px;
}
.header .section input{
    float: right;
     60%;
    height: 24px;
    margin-top: 12px;
    text-indent: 10px;
    border-radius: 5px;
    border: none;
}
.header .section button{
    float: right;
     35px;
    height: 24px;
    margin-top: 12px;
    border-radius: 5px;
    border: none;
    text-indent:10px 10px;
    text-align: center;
}

section.css

.section{
     600px;
    padding: 0 10px;
    margin: 0 auto;
    overflow:hidden;
}
.section h2{
    position: relative;
    display: block;
     100%;
    font-size: 24px;
    line-height: 30px;
    margin-block-start: 0.83em;
    margin-block-end: 0.83em;
    font-weight: bold;
    text-align: left
}
.section h2 span{
    position: absolute;
    top: 13px;
    right: 5px;
    display: inline-block;
    padding: 0 5px;
    height: 20px;
    border-radius: 20px;
    background: #E6E6FA;
    line-height: 22px;
    text-align: center;
    color: #666;
    font-size: 14px;
}
.section ul{
    list-style: none;
}
.section ul li{
    height: 32px;
    line-height: 32px;
    background: #fff;
    position: relative;
    margin-bottom: 10px;
    padding: 0 45px;
    border-radius: 3px;
    border-left: 5px solid #629A9C;
    box-shadow: 0 1px 2px rgba(0,0,0,0.07);
}
.section ul li>input{
    position: absolute;
    top: 6px;
    left: 10px;
     22px;
    height: 22px;
    cursor: pointer;
}
.section ul li a{
    position: absolute;
    top: 2px;
    right: 5px;
    display: inline-block;
     14px;
    height: 12px;
    border-radius: 14px;
    border: 6px double #FFF;
    background: #CCC;
    line-height: 14px;
    text-align: center;
    color: #FFF;
    font-weight: bold;
    font-size: 14px;
    cursor: pointer;
}
.section #donelist li{
    opacity: 0.5;
}

footer.css

.footer {
    color: #666;
    font-size: 15px;
    text-align: center;
}
.footer a{
    color: #666;
    text-decoration: none;
    color: #999;
}

reset.css

/*百度*/
body{ 
font-family:arial,helvetica,sans-serif; 
font-size:13px; 
font-size-adjust:none; 
font-stretch:normal; 
font-style:normal; 
font-variant:normal; 
font-weight:normal; 
line-height:1.4; 
text-align:center; 
} 
body, ul, ol, dl, dd, h1, h2, h3, h4, h5, h6, p, form, fieldset, legend, input, textarea, select, button, th, td { 
margin:0; 
padding:0; 
} 
h1, h2, h3, h4, h5, h6 { 
font-size:100%; 
font-weight:normal; 
} 
table { 
font-size:inherit; 
} 
input, select { 
font-family:arial,helvetica,clean,sans-serif; 
font-size:100%; 
font-size-adjust:none; 
font-stretch:normal; 
font-style:normal; 
font-variant:normal; 
font-weight:normal; 
line-height:normal; 
} 
button { 
overflow:visible; 
} 
th, em, strong, b, address, cite { 
font-style:normal; 
font-weight:normal; 
} 
li { 
list-style-image:none; 
list-style-position:outside; 
list-style-type:none; 
} 
img, fieldset { 
border:0 none; 
} 
ins { 
text-decoration:none; 
}

　　index.js

var todolist = $('todolist');
var donelist = $('donelist');
var todoCount = $('todocount');
var doneCount = $('donecount');
var todoc =0;
var donec=0;
//添加todolist
function postaction(){
    //获取用户输入内容
    var contant = $('searchinput').value;
    //判断
    if(contant.length === 0){
        alert('请输入内容');
        return;
    }
    //创建li标签插入
    var newli = document.createElement('li');
    newli.innerHTML ="<input type='checkbox' onchange ='update()'>"+"<p onclick='edit()'>"+ contant+ "</p>" + "<a herf = 'javescript:void(0)'>-</a>";
    $('todolist').insertBefore(newli,$('todolist').children[0]);
    loop('todolist');
    todoc++;
    todoCount.innerText = todoc;
    //清空输入框的内容
    $('searchinput').value = '';
}
// 循环每次添加不同的i值
function loop(str){
    var list = null;
    str ==='todolist' ? list = todolist :list =donelist;
 
    childs = list.childNodes;
    for(var i=0; i<childs.length;i++){
        childs[i].children[0].setAttribute('onchange','update("'+i+'","'+str+'")');
        childs[i].children[1].setAttribute('onclick','edit("'+i+'","'+str+'")');
        childs[i].children[1].setAttribute('onchange','change("'+i+'","'+str+'")');
        childs[i].children[2].setAttribute('href','javascript:remove("'+i+'","'+str+'")');
    }
}
//update方法
function update(n,str){
    var list = null;
    str === 'todolist' ? list = todolist : list = donelist;
 
    var li = null;
    childs = list.childNodes;
    for(var i=0;i<childs.length;i++){
        if(i===Number(n)){
            li = childs[i];
        }
    }
     // 删除原有的，得到li 并刷新了原有的li
    remove(n,str);
 
    if(str==='todolist'){
        if(donec ===0){
            donelist.appendChild(li);
        }else {
            donelist.insertBefore(li,donelist.children[0]);
        }
        loop('donelist');
        donec++;
        doneCount.innerText = donec;
    }else if(str ==='donelist'){
        todolist.appendChild(li);
        loop('todolist');
        todoc++;
        todoCount.innerText = todoc;
    }
}
//修改span
function edit(n,str){
    var list = null;
    str ==='todolist' ? list = todolist : list = donelist;
    childs = list.childNodes;
    p = childs[n].children[1];
    title = p.innerHTML;

    p.innerHTML="<input id='input-"+ n +"' value='"+title+"' />";
    var input = $("input-"+n);
    input.setSelectionRange(0,input.value.length);
    input.focus();
}
//修改input成p标签
function change(n,str){
    var list = null;
    str ==='todolist' ? list = todolist : list = donelist;
    childs = list.childNodes;
    p = childs[n].children[1];
    title = p.children[0].value;
    if(title.length === 0){
        alert("内容不能为空");
    }
    else{
        p.innerHTML = title;
    }
}
//删除一个li
function remove(n,str){
    var list=null;
    if (str==='todolist'){
        list = todolist;
        todoc--;
        todoCount.innerText = todoc;
    } else if(str==='donelist'){
        list = donelist;
        donec--;
        doneCount.innerText = donec;
    }
 
    childs = list.childNodes;
    for(var i=childs.length-1;i>=0;i--){
        if(i===Number(n)){
            list.removeChild(childs[n]);
        }
    }
    loop(str);
}
//删除全部li
function clear(){
    childs1 = todolist.childNodes;
    for(var i=childs1.length-1;i>=0;i--){
        todolist.removeChild(childs1[i]);
    }
    childs2 = donelist.childNodes;
    for(var j=childs2.length-1;j>=0;j--){
        donelist.removeChild(childs2[j]);
    }
    todoc = 0;
    donec = 0;
    todoCount.innerText = todoc;
    doneCount.innerText = donec;
}
//根据id获取
function $(id){
    return typeof id === 'string' ? document.getElementById(id) : null;
}

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>todolist</title>
    <link rel="stylesheet" type="text/css" href="css/reset.css">
    <link rel="stylesheet" type="text/css" href="css/header.css">
    <link rel="stylesheet" type="text/css" href="css/section.css">
    <link rel="stylesheet" type="text/css" href="css/footer.css">
</head>
<body>
    <div class="header">
        <div class="section">
            <h3>ToDolist</h3>
            <input type="text" name="title" placeholder="添加ToDo" id="searchinput">
            <button id="btn" onclick="postaction()">添加</button>
        </div>
    </div>
    <div class="section">
        <h2>
            正在进行
            <span id="todocount">0</span>
        </h2>
        <ul id="todolist"></ul>
        <h2>
            已经完成
            <span id="donecount">0</span>
        </h2>
        <ul id="donelist"></ul>
    </div>
    <div class="footer">
        
            Copyright © 2019 todolist.cn 
            <a href="javascript:clear();">clear</a>
    </div>
    <script type="text/javascript" src="js/index.js"></script>
</body>
</html>