<!DOCTYPE?HTML>
<html>
<head>
<meta?http-equiv="Content-Type"?content="text/html;?charset=utf-8"?/>
<title>if...else</title>
<script?type="text/JavaScript">
function?zz(){
var?myage;
????myage?=prompt("你的年齡")
if(myage<=44)
??{document.write("青年");}
else?if(myage<=59)?
??{document.write("中年人");}
else?if??(myage<=89)
??{document.write("老年人");}
else????????
??{document.write("長壽老年人");}
else{document.write("永遠十八")；}
}
</script>
</head>
<body>
????<from>
????????<input?type="button"?value="點次測試年齡段"?onclick="zz()">
????????</from>
</body>
</html>
2018-03-18
就因為最后這個分號,使用英文的就對了
2018-03-11
高手這個空格怎么弄的啊？
試了半天才發現的
2017-11-28
<!DOCTYPE?HTML> <html> <head> <meta?http-equiv="Content-Type"?content="text/html;?charset=utf-8"?/> <title>if</title> <script?type="text/javascript"> function?zz(){ var?myage; ????myage?=prompt("你的年齡") if(myage<=44) ??{document.write("青年");} else?if(myage<=59) ??{document.write("中年人");} else?if??(myage<=89) ??{document.write("老年人");} else?if(myage<=99) ??{document.write("長壽老年人");} else ??{document.write("永遠十八");} } </script> </head> <body> <from> ????????<input?type="button"?value="點次測試年齡段"?onclick="zz()"> </from> </body> </html>else????????
??{document.write("長壽老年人");}
else{document.write("永遠十八")；}
這里錯了，長壽老年人這塊判斷還要加一個條件才可以
else?if(myage<=99)
??{document.write("長壽老年人");}
else{document.write("永遠十八")；}這個最后的分號是在英文輸入法的分號;，不是中文輸入法的分號；
2017-11-16
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>if...else</title>
<script type="text/JavaScript">
function qwe(){
var myage=prompt("你的年齡");
if(myage<=44){
document.write("青年");
}
else if(myage<=59){
document.write("中年人");
}
else if(myage<=89){
document.write("老年人");
}
else if(myage>89){
document.write("長壽老年人");
}else{
document.write("永遠十八")
}
}
</script>
</head>
<body>
? ? <from>
? ? <input type="button" value="點擊測試年齡"? onclick="qwe()"/>? ?
? ? </from>
</body>
</html>