Javascript 如何检查字符串是否包含特定的子字符串
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How to check if a string contains a specific substring
提问by Andrew Ng
I'm working on a simple if/else jquery statement and I ran into some trouble with the variable. What I need it to do is to check if the var is true. In my case I want it to check if the has 'dont push' in it. If it's true, the html must change to 'lol'. If not, it will give a simple alert. Can anybody give me some guidance here?
我正在处理一个简单的 if/else jquery 语句，但在使用该变量时遇到了一些麻烦。我需要它做的是检查 var 是否为真。在我的情况下，我希望它检查是否有“不要推”。如果是这样，html 必须更改为“lol”。如果没有，它会给出一个简单的警报。有人可以在这里给我一些指导吗？
<!DOCTYPE html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="user-scalable=no, width=device-width" />
<title>Untitled Document</title>
<link href="mobile.css" rel="stylesheet" type="text/css" media="only screen and (max-width: 480px)" />
<script type="text/javascript" src="js/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$('#nietklikken').click(function() {
var n = $(this).html('dont push');
if (n == "$(this).html('dont push')"){
$(this).html('lol')
} else {
alert('lolz');
}
});
});
</script>
</head>
<body>
<button type="button" id="nietklikken">dont push</button>
</body>
</html>
回答by mmhan
$(this).html()will getthe innerhtml value and $(this).html(arg)will setthe innerhtml value. The correct usage will be below.
$(this).html()将getinnerHTML值和$(this).html(arg)将setinnerHTML值。正确用法如下。
$('#nietklikken').click(function() {
if ($(this).html().indexOf('dont push') > -1){
$(this).html('lol')
} else {
alert('lolz');
}
});
You should read up more in jquery docs.
您应该在jquery docs 中阅读更多内容。
Update: It will now check if the innerhtml contains 'dont push'.
更新：它现在将检查innerhtml 是否包含'dont push'。
回答by ipr101
回答by Ali
In general you could use a function like this
一般来说，你可以使用这样的函数
function HasSubstring(string,substring){
if(string.indexOf(substring)>-1)
return true;
return false;
}
回答by Greg B
You can get the HTML content of an element by calling the html()method with no arguments like so:
您可以通过调用html()不带参数的方法来获取元素的 HTML 内容，如下所示：
var innerHtml = $(someElement).html();
You can then check for the presence of a string by using indexOflike so:
然后，您可以使用indexOf如下方式检查字符串是否存在：
var position = "Find the string".indexOf("the");
// position = 5
If the given string isn't present, indexOfwill return -1.
如果给定的字符串不存在，indexOf将返回 -1。
var position = "Find the string".indexOf("notFound");
// position = -1
You can then use this in an ifstatement like so
然后你可以在这样的if语句中使用它
if($(someElement).html().indexOf("dont push") >-1)
{
// Required action here
}
回答by T.Todua
A working javascript code to check if string contains the specific word/substring:
用于检查字符串是否包含特定单词/子字符串的有效 javascript 代码：
var inputString = "this is my sentence";
var findme = "my";
if ( inputString.indexOf(findme) > -1 ) {
out.print( "found it" );
} else {
out.print( "not found" );
}
