javascript中Date對(duì)象應(yīng)用之簡(jiǎn)易日歷實(shí)現(xiàn)

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    這篇文章主要為大家詳細(xì)介紹了javascript中Date對(duì)象應(yīng)用之簡(jiǎn)易日歷實(shí)現(xiàn),具有一定的參考價(jià)值,感興趣的小伙伴們可以參考一下
    前面的話
    簡(jiǎn)易日歷作為javascript中Date對(duì)象的常見(jiàn)應(yīng)用,用途較廣泛,本文將詳細(xì)說(shuō)明簡(jiǎn)易日歷的實(shí)現(xiàn)思路。
    HTML說(shuō)明
    使用type=number的兩個(gè)input分別作為年和月的輸入控件,這樣在高級(jí)瀏覽器下自帶調(diào)節(jié)按鈕
    按照周日到周一的順序進(jìn)行星期的排列
    <div>
     <header class='control'>
     <input id="conYear" type="number" min="1900" max="2100" step="1"/>
     <input id="conMonth" type="number" min="1" max="12" step="1"/>
     </header>
     <div>
     <header class='week'>
     <div>周日</div>
     <div>周一</div>
     <div>周二</div>
     <div>周三</div>
     <div>周四</div>
     <div>周五</div>
     <div>周六</div>
     </header>
     <section id='dayBox'>
     <div id="day1">1</div>
     <div>2</div>
     <div>3</div>
     <div>4</div>
     <div>5</div>
     <div>6</div>
     <div>7</div>
     <div>8</div>
     <div>9</div>
     <div>10</div>
     <div>11</div>
     <div>12</div>
     <div>13</div>
     <div>14</div>
     <div>15</div>
     <div>16</div>
     <div>17</div>
     <div>18</div>
     <div>19</div>
     <div>20</div>
     <div>21</div>
     <div>22</div>
     <div>23</div>
     <div>24</div>
     <div>25</div>
     <div>26</div>
     <div>27</div>
     <div>28</div>
     <div>29</div>
     <div id="day30">30</div>
     <div id="day31">31</div>
     </section>
     </div> 
    </div>
    CSS說(shuō)明
    對(duì)于簡(jiǎn)易日歷的實(shí)現(xiàn),首先確定日歷中class="day"的div的排列方式為浮動(dòng)。這樣可以通過(guò)改變第一天div的位置,來(lái)實(shí)現(xiàn)所有同級(jí)div都可以跟隨移動(dòng)的效果 
    body{
     margin: 0;
    }
    input{
     border: none;
     padding: 0;
    }
    .box{
     width: 354px;
     margin: 30px auto 0; 
    }
    .DateBox{
     height: 300px;
     border: 2px solid black;
    } 
    .week{
     overflow: hidden;
     border-bottom: 1px solid black;
     line-height: 49px;
    }
    .week-in{
     height: 49px;
     float: left;
     width: 50px;
     text-align: center;
    }
    .dayBox{
     overflow: hidden;
    }
    .day{
     float: left;
     height: 50px;
     width: 50px;
     font:20px/50px '微軟雅黑';
     text-align: center;
    }
    .control{
     overflow: hidden;
    }
    .con-in{
     height: 50px;
     float: left;
     width: 100px;
     text-align: center;
     font: 20px/50px "微軟雅黑";
    }
    JS說(shuō)明
    簡(jiǎn)易日歷的JS邏輯總共需要5個(gè)實(shí)現(xiàn):
    【1】需要獲取當(dāng)月的天數(shù),獲取當(dāng)月第一天、第30天、第31天是周幾
    【2】根據(jù)當(dāng)月第一天的星期,改變第一天的margin-left值,移動(dòng)第一天到對(duì)應(yīng)的位置;由于浮動(dòng)的關(guān)系,其余天也會(huì)跟著移動(dòng)到對(duì)應(yīng)的位置
    【3】根據(jù)當(dāng)月的天數(shù),隱藏多余的天;當(dāng)然,隱藏之前要先顯示在其他月份可能被隱藏的天
    【4】如果當(dāng)月30日是周日,則會(huì)新占一行。這時(shí)通過(guò)改變30日這天的margin值將其移動(dòng)到第一行(若31日可能會(huì)新占一行,也做相似處理)
    【5】載入頁(yè)面后,獲取當(dāng)前的年和月,顯示當(dāng)月日歷;當(dāng)改變年或月時(shí),獲取改變后的值,更新日歷 
    //準(zhǔn)備:獲取當(dāng)前樣式
    function getCSS(obj,style){
     if(window.getComputedStyle){
     return getComputedStyle(obj)[style];
     }
     return obj.currentStyle[style];
    }
    //實(shí)現(xiàn)一:獲取當(dāng)月的天數(shù),及當(dāng)月第一天、第30日、第31日是星期幾
    function get_data(year,month){
     var result = {};
     var d = new Date();
     //如果是2月
     if(month == 2){
     //如果是閏年
     if((year % 4 === 0 && year % 100 !== 0) || year % 400 === 0){
     result.days = 29;
     //如果是平年
     }else{
     result.days = 28;
     }
     //如果是第4、6、9、11月
     }else if(month == 4 || month == 6 ||month == 9 ||month == 11){
     result.days = 30;
     }else{
     result.days = 31;
     //當(dāng)月第31天是星期幾
     result.day31week = d.getDay(d.setFullYear(year,month-1,31));
     }
     //當(dāng)月第一天是星期幾
     result.day1week = d.getDay(d.setFullYear(year,month-1,1));
     if(month != 2){
     //當(dāng)月第30天是星期幾
     result.day30week = d.getDay(d.setFullYear(year,month-1,30)); 
     }
     return result;
    }
    //實(shí)現(xiàn)二:根據(jù)當(dāng)月第一天的星期x,設(shè)置第一天的margin-left=寬度*x,使其對(duì)應(yīng)到正確的星期位置上
    function move_day1(year,month){
     var week1 = get_data(year,month).day1week;
     day1.style.marginLeft = week1%7*parseInt(getCSS(day1,'width'))+ 'px';
    }
    //實(shí)現(xiàn)三:根據(jù)當(dāng)月的天數(shù),來(lái)隱藏多余的天數(shù)。當(dāng)然首先要先顯示在其他月份被隱藏的天數(shù)
    function hide_days(year,month){
     //恢復(fù)其他月份可能隱藏的天數(shù)
     for(var i = 28; i<31; i++){
     dayBox.children[i].style.display = 'block';
     } 
     //隱藏當(dāng)月多余的天數(shù)
     var days = get_data(year,month).days;
     for(var i = days;i<31;i++){
     dayBox.children[i].style.display = 'none';
     }
    };
    //實(shí)現(xiàn)四:如果當(dāng)月30日或31日是星期日,則會(huì)新占一行,通過(guò)設(shè)置margin-top把新占一行的天移動(dòng)到第一行
    function move_day30(year,month){
     //如果當(dāng)月30日是星期日
     if(get_data(year,month).day30week === 0){
     day30.style.marginTop = parseInt(getCSS(day30,'height')) *(-5) + 'px';
     day31.style.marginTop = parseInt(getCSS(day31,'height')) *(-5) + 'px';
     day31.style.marginLeft= getCSS(day31,'width');
     return;
     }else{
     day30.style.marginTop = day31.style.marginTop = day31.style.marginLeft ='0';
     }
     //如果當(dāng)月31日是星期日
     if(get_data(year,month).day31week === 0){
     day31.style.marginTop = parseInt(getCSS(day31,'height')) *(-5) + 'px';
     }else{
     day31.style.marginTop = '0';
     }
    }
    //實(shí)現(xiàn)五:當(dāng)載入頁(yè)面時(shí),獲取當(dāng)前年和月,顯示當(dāng)月日歷;當(dāng)改變年或月時(shí),獲取改變后的年和月,更新當(dāng)月日歷
    var year= conYear.value=new Date().getFullYear();
    var month= conMonth.value = new Date().getMonth() + 1;
    move_day1(year,month);
    hide_days(year,month);
    move_day30(year,month);
    conYear.onchange = conMonth.onchange = function(){
     var year = conYear.value;
     var month = conMonth.value;
     if(year<1900 || year >2100 ){
     year = conYear.value=new Date().getFullYear();
     }
     if(month<1 || month > 12){
     month = conMonth.value=new Date().getMonth() + 1;
     }
     move_day1(year,month);
     hide_days(year,month);
     move_day30(year,month);
    }
    以上就是本文的全部?jī)?nèi)容,希望對(duì)大家的學(xué)習(xí)有所幫助