函數(shù)結(jié)合switch怎么實(shí)現(xiàn)不了
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>switch</title>
<script type="text/JavaScript">
function my()
{var myweek =document.getElementById("con").value;//myweek表示星期幾變量
switch(myweek)
{
?case 1:
?case 2:
alert("學(xué)習(xí)理念知識");
?break;
?case 3:
?case 4:
?alert("到企業(yè)實(shí)踐");
?break;
?case 5:
?alert("總結(jié)經(jīng)驗(yàn)");
?break
?default
?alert("周六、日休息和娛樂");
}
}
</script>
</head>
<body>周計(jì)劃
<input type="txt" id="con">
<input type="button" value="點(diǎn)擊" onclick="my()">
</body>
</html>
2015-10-24
假設(shè)你輸入的是3,document.getElementById("con").value;得到的是"3"而不是3,是個(gè)字符而不是數(shù)字哦,除了上面的抓根寶同學(xué)提到的強(qiáng)制變換數(shù)據(jù)類型以外,也可以把<input type="txt" id="con">里的txt修改成number。
2015-08-15
document.getElementById("con").value 得到的值類型為string
而你switch的是number
解決方法:myweek = Number(myweek)或myweek = myweek - 0