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js 实现简单日历效果

2019-04-28 19:21 585 查看

主要理解js部分的实现逻辑，HTML和css部分都可按自己项目操作。

html部分

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="css/class.css">

</head>
<body>
<div class="all">
<div class="rili">
<div class="riliTop">
<span  id="previous" class="fl">&lt;</span>
<span class="showTime" id="showTime">0000-00</span>
<span id="next" class="fr">&gt;</span>
</div>
<ul class="riliHeader">
<li>日</li>
<li>一</li>
<li>二</li>
<li>三</li>
<li>四</li>
<li>五</li>
<li>六</li>
</ul>
<ul class="riliContent" id="riliContent">

</ul>
</div>
</div>
<script src="js/class.js"></script>
</body>
</html>

CSS部分

*{
margin: 0;
padding: 0;
}
.all {
margin-right: auto;
margin-left: auto;
}

.clock{
width:320px;
text-align: center;
margin-left:auto;
margin-right:auto;
transition: all 1s;
}

.rili{
margin-left: auto;
margin-right: auto;
width: 350px;
border:1px #ddd solid;
}
ul,li,ol{
list-style: none;
}
.riliHeader{
height: 50px;
border-bottom:1px #ddd solid;
background: #eee;
}
.riliHeader li, .riliContent li{
float: left;
width: 48px;
height: 48px;
line-height: 48px;
font-size: 16px;
text-align: center;
border:1px #ddd solid;
}
.riliContent{
height: 300px;
}
.riliContent li.on{
color: #f00;
}
.fl{
float: left;}
.fr{
float: right;}
#previous,#next{cursor: pointer; margin:15px;width:15px; height:15px;border-radius: 15px;background: white;display: block;text-align:center;line-height: 15px;}
.riliTop .showTime{
height: 50px;
line-height: 50px;
margin-left: 50%;
display: inline-block;
position: relative;
left: -65px;
}
.riliTop{
background: #55a532;
}

JS部分

{
let riliContent=document.getElementById('riliContent');
let showTime=document.getElementById('showTime');
let previous=document.getElementById('previous');
let next=document.getElementById('next');

let newDate = new Date();

let yearNum = newDate.getFullYear();
let monthNum = newDate.getMonth();
let dateNum = newDate.getDate();

let everyday = function(days){

let year = days.getFullYear();
let month = days.getMonth()+1;

let lastDay = new Date(year,month,0);
let lastDay_date = lastDay.getDate();//这个月的最后一天
let firstDay = new Date(year,month-1,1);
let firstDay_day = firstDay.getDay();//这个月第一天

//上个月的最后一天
let pDay =new Date(year,month-1,0);
let last_p_day =pDay.getDate();

let n=0;//前几个灰色数生成
for (let j =0;j<firstDay_day;j++)
{   n++;
let LI = document.createElement("li");
last_p_days = last_p_day - firstDay_day;
LI.innerHTML = last_p_days+n;
LI.style.color = "#ddd";
riliContent.appendChild(LI);
}
//本月数生成
for (let i = 1; i <= lastDay_date; i++) {
let LI = document.createElement("li");
LI.innerHTML = i;
(year === newDate.getFullYear() && month === newDate.getMonth()+1 && newDate.getDate() === i)&& (LI.style.color ="red");
riliContent.appendChild(LI);
}
for (let m=1; m<=42-lastDay_date-firstDay_day;m++)
{
let LI = document.createElement("li");
LI.innerHTML = m;
LI.style.color = "#ddd";
riliContent.appendChild(LI);
}

showTime.innerHTML = year +"-" + month;
};

previous.addEventListener("click",function () {
riliContent.innerHTML ="";
monthNum--;
everyday(new Date(yearNum,monthNum,dateNum));
});

next.addEventListener("click",function () {
riliContent.innerHTML ="";
monthNum++;
everyday(new Date(yearNum,monthNum,dateNum));
});
everyday(newDate);

}

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