javascript - jquery href .indexOf，如何排除

Question

假设我在 www.forum.com，除了主页之外，URL 总是包含各种附加文本，例如，www.forum.com/post1/oh-yeah 或 www.forum.com/post999/oh-baby 但我想创建一个 if 语句来排除除 www.forum.com 之外的所有内容，我该怎么做？

换句话说，如何做到这一点:

if ( href.indexOf('forum.com') === 'forum.com' ){
    console.log('href value is exactly forum.com, with no additional string');
} else {
    console.log('href url contains more than just forum.com');
}

谢谢。

Answer 1

当您调用href.indexOf('forum.com')时，结果是一个整数。如果您得到-1，那是因为它不存在。

The indexOf() method returns the position of the first occurrence of a specified value in a string. This method returns -1 if the value to search for never occurs. For more information

因此，您需要执行 (href.indexOf('/') = ，而不是 (href.indexOf('forum.com') === 'forum.com') = -1) 这意味着 www.forum.com

之后没有任何内容

if (href.indexOf('/') == -1) {
  console.log('href value is exactly forum.com, with no additional string');
} else {
  console.log('href url contains more than just forum.com');
}

此代码片段可能有帮助

href = "www.forum.com/test-1";

if (href.indexOf('/') == -1) {
  document.getElementById("test").innerHTML = "href value is exactly forum.com, with no additional string";
} else {  
  document.getElementById("test").innerHTML = "href url contains more than just forum.com";
}

href = "www.forum.com";

if (href.indexOf('/') == -1) {
  document.getElementById("test1").innerHTML = "href value is exactly forum.com, with no additional string";
} else {  
  document.getElementById("test1").innerHTML = "href url contains more than just forum.com";
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<p id="test">Test</p>

<p id="test1">Test</p>