Question

	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>

这就是我所拥有的。我想知道的是，如何看到提示中输入的文字最后有一个问号。

Answer 1

如果Prompt是一个字符串，那么它应该就像

一样简单

{{1}}

Answer 2

if (Prompt.slice(-1) === "?") {
    ...
}

Answer 3

var lastChar = (Prompt.trim().substr(-1) === '?')

Answer 4

您可以使用charAt（）方法：

var lastChar = Prompt.charAt(Prompt.length-1);
if (lastChar === "?") {
    // your logic here
}

检查最后一个字符是否是javascript中的问号

4 个答案: