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Date functions and flexible use of function encapsulation

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Release: 2017-06-26 11:48:17
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<script><br>    /*<br>    * 获取指定年月份的日期总天数<br>    * 显示的月份的第一天是星期几?<br>    * */</p> <p>var yearSelectElement = document.querySelector('#yearSelect');<br>    var monthSelectElement = document.querySelector('#monthSelect');<br>    var tbody = document.querySelector('tbody');<br>    var strongElement = document.querySelector('strong');</p> <p>var nowDate = new Date();</p> <p>/*<br>    * 动态生成option<br>    * */<br>    var html = '';<br>    for (var i=1970; i<2100; i++) {<br/>        if (i == nowDate.getFullYear()) {<br/>            html = '<option selected>'+ i +'</option>' + html;<br>        } else {<br>            html = '<option>'+ i +'</option>' + html;<br>        }</p> <p>}<br>    yearSelectElement.innerHTML = html;</p> <p>var html = '';<br>    for (var i=0; i<12; i++) {<br/>        if (i == nowDate.getMonth()) {<br/>            html += '<option value="'+i+'" selected>'+ (i+1) +'</option>';<br>        } else {<br>            html += '<option value="'+i+'">'+ (i+1) +'</option>';<br>        }</p> <p>}<br>    monthSelectElement.innerHTML = html;</p> <p>/*<br>    * 默认显示当前年和月的日历<br>    * */<br>    calendar(nowDate.getFullYear(), nowDate.getMonth());</p> <p>/*<br>    * 根据选择的年和月重新生成日历<br>    * */<br>    yearSelectElement.onchange = monthSelectElement.onchange = function() {<br>        calendar(yearSelectElement.value, monthSelectElement.value);<br>    };</p> <p>function calendar(year, month) {<br>        year = Number(year);<br>        month = Number(month);<br>        strongElement.innerHTML = year + '年' + (month+1) + '月';</p> <p>var html = '<tr>';<br>        for (var i=1; i<=42; i++) {</p> <p>if (i%7 == 1 && i != 1) {<br>                html += '</tr><tr>';<br>            }</p> <p>var v = i- getFirstDay(year, month);</p> <p>if (v < 1 || v > getDays(year, month)) {<br>                html += '<td> </td>';<br>            } else {<br>                if (i % 7 == 1 || i % 7 == 0) {<br>                    html += '<td style="color: red">'+ v +'</td>';<br>                } else if (<br>                    year == nowDate.getFullYear()<br>                    &&<br>                    month == nowDate.getMonth()<br>                    &&<br>                    v == nowDate.getDate()<br>                ) {<br>                    html += '<td style="background: red; color:white;">'+ v +'</td>';<br>                } else {<br>                    html += '<td>'+ v +'</td>';<br>                }<br>            }</p> <p><br>        }<br>        html += '</tr>';<br>        tbody.innerHTML = html;<br>    }</p> <p>/*<br>    * 获取指定显示年月份的日期总天数<br>    * */<br>    function getDays(y, m) {<br>        return new Date(y, m+1, 1, -1, 0, 0).getDate();</p> <p>/*<br>        * 得到下一月的1日,-1时0分0秒的日期<br>        * -1 : 其实就是前一天,表示就是上个月的最后一天的23时<br>        * */<br>        var date = new Date(y, m+1, 1, -1, 0, 0);<br>        /*<br>        * 上个月最后一天的日期其实就是上个月总的天数<br>        * */<br>        return date.getDate();<br>    }</p> <p>/*<br>    * 获取指定显示的年月份的第一天是星期几<br>    * */<br>    function getFirstDay(y, m) {<br>        return new Date(y, m, 1).getDay();<br>    }<br></script>

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