在我的代码顶部,我需要询问用户是否希望玩游戏。使用字符串函数查看答案的第一个字母并将其设为小写。如果他们的回答==“y”则玩游戏。我需要帮助取正确的第一个字母,并将其缩小。
<HTML>
<HEAD>
</HEAD>
<BODY>
<FORM NAME="testform">
<BR>
<BR>
<BR>
</FORM>
<INPUT id="attempts" TYPE="text" NAME="inputbox" VALUE="" />
<INPUT id="zero" TYPE="button" NAME="resetbox" VALUE="Reset " onclick="reset()" />
<SCRIPT type="text/javascript">
varattempts = 0
x = Math.round((Math.random()*19))+1
var tip
tip=prompt("Do you want to play a game?")
while(tip == "y")
{
var Guess;
document.getElementById('attempts').value = 0;
do {
Guess = prompt("Pick a number between 1 and 20","")
if (Guess === null) break;
document.getElementById('attempts').value = parseInt(document.getElementById('attempts').value)+1
} while (Guess!=x);
if (Guess == x)
{
alert("You guessed right!")
}
}
function reset()
{
varattempts=0;
document.getElementById('attempts').value = 'Attempts: 0';
}
</SCRIPT>
</BODY>
</HTML>
答案 0 :(得分:2)
要获取任何字符串的第一个字母,您可以使用.charAt(0)
:
var firstChar = myString.charAt(0);
并将其转换为小写:
var firstChar = myString.charAt(0).toLowerCase();
瞧!