首頁猿問這里的日為什么不會(huì)動(dòng)態(tài)變化啊

這里的日為什么不會(huì)動(dòng)態(tài)變化啊

JavaScript

漫之旅 2015-12-09 15:40:32

<!DOCTYPE HTML><html> <head> <title>年月日</title> <script type="text/javascript"> function one(){ //創(chuàng)建年 var year=document.getElementById('year'); var date=new Date(); for(var i=1900;i<=date.getFullYear();i++){ var y=document.createElement("option"); y.innerText=i; year.appendChild(y); } //創(chuàng)建月 var month=document.getElementById("month"); for(var i=1;i<=12;i++){ var m=document.createElement("option"); m.innerText=i; month.appendChild(m); } //創(chuàng)建日 var day=document.getElementById("day"); var run=0; var ye=parseInt(year.value); var mo=parseInt(month.value); switch(mo){case 1:case 3:case 5:case 7:case 8:case 10:case 12: run=3; break; case 4:case 6:case 6:case 11: run=2; break; case 2: if(ye%4==0&&ye%100!=0||ye%400==0){ run=1; break; } } for(var i=1;i<=28+run;i++){ var d=document.createElement("option"); d.innerText=i; day.appendChild(d); } } </script> </head> <body onLoad="one()"> <table> <tr> <td> <select id="year"> </select> </td> <td> <select id="month"> </select> </td> <td> <select id="day"> </select> </td> </tr> </table> </body></html>

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2 回答

李曉健

TA貢獻(xiàn)1036條經(jīng)驗(yàn) 獲得超461個(gè)贊

因?yàn)槟阋贿M(jìn)來就是1月呀 ?所以就會(huì)是31天，然后就不會(huì)再變了

你可以試下這樣，當(dāng)年和月改變時(shí)再生成一次

<body?onLoad="one()">
<table>
????<tr>
????????<td>
????????????<select?id="year"?onchange="one()">
????????????</select>
????????</td>
????????<td>
????????????<select?id="month"?onchange="one()">
????????????</select>
????????</td>
????????<td>
????????????<select?id="day">
????????????</select>
????????</td>
????</tr>
</table>
</body>

反對回復(fù) 2015-12-09