我需要创建两个函数，请求用户输入一个字符和一个字符串。 输入与给定字符串匹配。
然后告诉用户，如果在默认给定字符串中找到输入字符/字符串。
到目前为止，我已经创建了获取用户输入的基础知识，但找不到任何方法来实现 JavaScript 函数。 任何帮助将不胜感激。
这是到目前为止我的代码..!
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width shrink-to-fit=no initial-scale=1">
<title>Web Programming is fun!</title>
<link rel="stylesheet"
href="https://cdn.jsdelivr.net/npm/<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="dcbeb3b3a8afa8aebdac9ce8f2eaf2ec" rel="noreferrer noopener nofollow">[email protected]</a>/dist/css/bootstrap.min.css"
integrity="sha384-B0vP5xmATw1+K9KRQjQERJvTumQW0nPEzvF6L/Z6nronJ3oUOFUFpCjEUQouq2+l"
crossorigin="anonymous"
>
<style>
p{display: inline;}
</style>
</head>
<body>
<div class="container">
<h1>Web Programming is Fun!</h1>
<br>
<p>Lets use the above heading string to demonstrate inbuilt methods.</p>
<label for="inputCharacter">Please type a character: </label>
<input type="text" id="inputCharacter">
<button onclick="matchCharacter()">Match Character</button>
<p id="character"></p>
<br>
<label for="inputString">Please type a string: </label>
<input type="text" id="inputString">
<button onclick="matchString()">Match String</button>
<p id="string"></p>
<script>
let text ="Web programming is fun!";
function matchCharacter()
{
var char=document.getElementById("inputCharacer").innerHTML;
if(char.indexOf(text) )
{
alert("Your Character is found in the string!")
}
}
function matchSring()
{
}
</script>
</div>
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js"
integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj"
crossorigin="anonymous">
</script>
<script
src="https://cdn.jsdelivr.net/npm/<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="17757878636463657667572339213927" rel="noreferrer noopener nofollow">[email protected]</a>/dist/js/bootstrap.bundle.min.js"
integrity="sha384-Piv4xVNRyMGpqkS2by6br4gNJ7DXjqk09RmUpJ8jgGtD7zP9yug3goQfGII0yAns"
crossorigin="anonymous">
</script>
</body>
</html>最佳答案
我认为你颠倒了参数。您应该使用text.indexOf，而不是char.indexOf。
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/indexOf
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width shrink-to-fit=no initial-scale=1">
<title>Web Programming is fun!</title>
<link rel="stylesheet"
href="https://cdn.jsdelivr.net/npm/<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="44262b2b30373036253404706a726a74" rel="noreferrer noopener nofollow">[email protected]</a>/dist/css/bootstrap.min.css"
integrity="sha384-B0vP5xmATw1+K9KRQjQERJvTumQW0nPEzvF6L/Z6nronJ3oUOFUFpCjEUQouq2+l"
crossorigin="anonymous"
>
<style>
p{display: inline;}
</style>
</head>
<body>
<div class="container">
<h1>Web Programming is Fun!</h1>
<br>
<p>Lets use the above heading string to demonstrate inbuilt methods.</p>
<label for="inputCharacter">Please type a character: </label>
<input type="text" id="inputCharacter" maxLength="1">
<button onclick="matchCharacter()">Match Character</button>
<p id="character"></p>
<br>
<label for="inputString">Please type a string: </label>
<input type="text" id="inputString">
<button onclick="matchString()">Match String</button>
<p id="string"></p>
<script>
let text ="Web Programming is Fun!";
function matchCharacter()
{
var char=document.getElementById("inputCharacter").value;
if(text.indexOf(char) != -1)
{
alert("Your Character is found in the string!")
} else {
alert("Your Character is not found in the string!")
}
}
function matchString()
{
var string=document.getElementById("inputString").value;
if(text.indexOf(string) != -1)
{
alert("String Found in heading!")
} else {
alert("String not found in the heading!")
}
}
</script>
</div>
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js"
integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj"
crossorigin="anonymous">
</script>
<script
src="https://cdn.jsdelivr.net/npm/<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="fe9c91918a8d8a8c9f8ebecad0c8d0ce" rel="noreferrer noopener nofollow">[email protected]</a>/dist/js/bootstrap.bundle.min.js"
integrity="sha384-Piv4xVNRyMGpqkS2by6br4gNJ7DXjqk09RmUpJ8jgGtD7zP9yug3goQfGII0yAns"
crossorigin="anonymous">
</script>
</body>
</html>关于javascript - 提示用户输入字符/字符串并判断输入是否在给定字符串中，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/69111705/