检查最后一个字符是否是JavaScript中的问号
[英]Check if last character is a question mark in javascript
问题描述
function askQuestion(){ var Prompt = prompt("What yes or no question do you have?", "Type it here..."); var number = Math.floor((Math.random() * 8) + 1); if(Prompt != null){ if (number == 1){ alert("Signs point yo yes."); }else if(number == 2){ alert("Yes."); }else if(number == 3){ alert("Reply hazy, try agian."); }else if(number == 4){ alert("Doubtful."); }else if(number == 5){ alert("All signs point to no."); }else if(number == 6){ alert("Most Likely."); }else if(number == 7){ alert("Absolutely."); }else if(number == 8){ alert("It doesn't look good."); } }else{ alert("Please re-ask the Magic 8 Ball.") } }
<body bgColor="Black"> <center><img src="8ball.png" onClick="askQuestion()" style="cursor:pointer;"></center> </body>
This is what I have. 
这就是我所拥有的。 What I would like to know, is how to see the text typed in the prompt has a question mark at the end. 我想知道的是，如何查看提示中键入的文本在末尾带有问号。
4 个解决方案
解决方案1
2 2015-11-06 20:39:04
if Prompt is a string then it should just be as simple as 如果Prompt是一个字符串，那么它应该像
var lastChar = Prompt.slice(-1);
if(lastChar == '?') { .... }
解决方案2
2 2015-11-06 20:40:12
if (Prompt.slice(-1) === "?") { ... }
解决方案3
2 2015-11-06 20:40:33
var lastChar = (Prompt.trim().substr(-1) === '?')
解决方案4
0 2015-11-06 22:07:17
You can use the charAt() method: 您可以使用charAt（）方法：
var lastChar = Prompt.charAt(Prompt.length-1);
if (lastChar === "?") {
// your logic here
}
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