blocks|key|218465|text|我使用的一种可靠方法是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|218466|if($("#checkSurfaceEnvironment-1").prop('checked')+==+true){
++++//do+something
}|code-block|syntax|javascript|218467|如果要迭代选中的元素，请使用父元素|218468|$("#parentId").find("checkbox").each(function(){
++++if+($(this).prop('checked')==true){+
++++++++//do+something
++++}
});|218469|更多信息：|218470|这很有效，因为所有复选框都有一个选中的属性，用于存储复选框的实际状态。如果您希望检查页面并尝试选中和取消选中复选框，您将注意到“已选中”属性(如果存在)将保持不变。此属性仅表示checkbox的初始状态，而不是当前状态。当前状态存储在该复选框的dom元素的属性checked中。|218471|请参阅Properties+and+Attributes+in+HTML|offset|length|218472|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/6003819/properties-and-attributes-in-html^0|0|0|0|0|0|0|3|X|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|12|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|13|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|14|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|15|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|16|8|@]|9|@$Q|17|R|18|1|19]]|A|$]]|$1|S|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]]]

One reliable way I use is:

<pre><code>if($("#checkSurfaceEnvironment-1").prop('checked') == true){
 //do something
}
</code></pre>

If you want to iterate over checked elements use the parent element

<pre><code>$("#parentId").find("checkbox").each(function(){
 if ($(this).prop('checked')==true){ 
 //do something
 }
});
</code></pre>

More info:

This works well because all checkboxes have a property checked which stores the actual state of the checkbox. If you wish you can inspect the page and try to check and uncheck a checkbox, and you will notice the attribute "checked" (if present) will remain the same. This attribute only represents the initial state of the checkbox, and not the current state. The current state is stored in the property checked of the dom element for that checkbox.

See <a href="https://stackoverflow.com/questions/6003819/properties-and-attributes-in-html">Properties and Attributes in HTML</a>

blocks|key|223466|text|if+(!$("#checkSurfaceEnvironment-1").is(":checked"))+{
++++//+do+something+if+the+checkbox+is+NOT+checked
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|223467|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>if (!$("#checkSurfaceEnvironment-1").is(":checked")) {
 // do something if the checkbox is NOT checked
}
</code></pre>

blocks|key|2871472|text|您还可以使用jQuery+方法或选择器：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2871473|if+($('#checkSurfaceEnvironment').not(':checked').length)+{
++++//+do+stuff+for+not+selected
}|code-block|syntax|javascript|2871474|JSFiddle+Example|offset|length|2871475|2871476|补充说明|2871477|来自:not()选择器的jQuery+API文档。|style|CODE|2871478|与将复杂的选择器或变量推入：|BOLD|2871479|+()选择器过滤器相比，.not()方法最终将为您提供更具可读性的选择。在大多数情况下，这是一个更好的选择。|blockquote|2871480|2871481|entityMap|0|LINK|mutability|MUTABLE|url|https://jsfiddle.net/1b07bqsu/16/^0|0|0|0|G|0|0|0|0|2|6|0|D|1|0|0|3|C|6|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|17|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|18|8|@]|9|@$I|19|J|1A|1|1B]]|A|$]]|$1|K|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|1D|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|1E|8|@$I|1F|J|1G|P|Q]]|9|@]|A|$]]|$1|R|3|S|5|6|7|1H|8|@$I|1I|J|1J|P|T]]|9|@]|A|$]]|$1|U|3|V|5|W|7|1K|8|@$I|1L|J|1M|P|T]|$I|1N|J|1O|P|T]]|9|@]|A|$]]|$1|X|3|-4|5|6|7|1P|8|@]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1Q|8|@]|9|@]|A|$]]]|Z|$10|$5|11|12|13|A|$14|15]]]]

You can also use either jQuery <a href="http://api.jquery.com/not/" rel="noreferrer"><code>.not()</code></a> method or <a href="http://api.jquery.com/not-selector/" rel="noreferrer"><code>:not()</code></a> selector:

<pre><code>if ($('#checkSurfaceEnvironment').not(':checked').length) {
 // do stuff for not selected
}
</code></pre>

<a href="https://jsfiddle.net/1b07bqsu/16/" rel="noreferrer">JSFiddle Example</a>

<hr>

<h3>Additional Notes</h3>

From the jQuery API documentation for the <code>:not()</code> selector:

<blockquote>
 The .not() method will end up providing you with more readable
 selections than pushing complex selectors or variables into a :not()
 selector filter. In most cases, it is a better choice. 
</blockquote>

blocks|key|221637|text|另一种方式：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|221638|这是一个working+example，这是代码，你也应该使用prop。|offset|length|221639|$('input[type="checkbox"]').mouseenter(function()+{+
++++if+($(this).is(':checked'))+{
++++++++//$(this).prop('checked',false);
++++++++alert("is+checked");
++++}+else+{
+++++++++//$(this).prop('checked',true);
++++++++alert("not+checked");
++++}
});​|code-block|syntax|javascript|221640|我注释掉了切换选中属性的方法。|221641|entityMap|0|LINK|mutability|MUTABLE|url|http://jsfiddle.net/aayb9/^0|0|4|F|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@$D|W|E|X|1|Y]]|A|$]]|$1|F|3|G|5|H|7|Z|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|10|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

An alternative way:

Here is a <a href="http://jsfiddle.net/aayb9/" rel="noreferrer">working example</a> and here is the code, you should also use prop.

<pre><code>$('input[type="checkbox"]').mouseenter(function() { 
 if ($(this).is(':checked')) {
 //$(this).prop('checked',false);
 alert("is checked");
 } else {
 //$(this).prop('checked',true);
 alert("not checked");
 }
});​
</code></pre>

I commented out the way to toggle the checked attribute.

blocks|key|221658|text|我认为(使用jQuery)检查是否选中复选框的最简单方法是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|221659|如果‘checked’，则为：|offset|length|style|BOLD|221660|if+($(this).is(':checked'))+{
//+I'm+checked+let's+do+something
}|code-block|syntax|javascript|221661|如果未‘checked’，则为：|221662|if+(!$(this).is(':checked'))+{
//+I'm+NOT+checked+let's+do+something
}|221663|entityMap^0|0|E|1|0|0|F|1|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@$D|U|E|V|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|W|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|X|8|@$D|Y|E|Z|F|G]]|9|@]|A|$]]|$1|O|3|P|5|J|7|10|8|@]|9|@]|A|$K|L]]|$1|Q|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|R|$]]

I think the easiest way (with jQuery) to check if checkbox is checked or NOT is:

if 'checked':

<pre><code>if ($(this).is(':checked')) {
// I'm checked let's do something
}
</code></pre>

if NOT 'checked':

<pre><code>if (!$(this).is(':checked')) {
// I'm NOT checked let's do something
}
</code></pre>

blocks|key|218478|text|if+(+$("#checkSurfaceEnvironment-1").is(":checked")+&&+$("#checkSurfaceEnvironment-2").not(":checked")+)|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|218479|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>if ( $("#checkSurfaceEnvironment-1").is(":checked") &amp;&amp; $("#checkSurfaceEnvironment-2").not(":checked") )
</code></pre>

blocks|key|2871486|text|我正在寻找一个更直接的实现，就像avijendr建议的那样。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2871487|我在他/她的语法上遇到了一些问题，但我让它工作了：|2871488|if+($('.user-forms+input[id*="chkPrint"]:not(:checked)').length+>+0)|code-block|syntax|javascript|2871489|在我的例子中，我有一个具有类user-forms的表，并且我正在检查是否有任何在其id中包含字符串checkPrint的复选框是未选中的。|offset|length|style|CODE|2871490|entityMap^0|0|0|0|E|A|15|2|1D|A|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@$K|U|L|V|M|N]|$K|W|L|X|M|N]|$K|Y|L|Z|M|N]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|P|$]]

I was looking for a more direct implementation like avijendr suggested.

I had a little trouble with his/her syntax, but I got this to work:

<pre><code>if ($('.user-forms input[id*="chkPrint"]:not(:checked)').length &gt; 0)
</code></pre>

In my case, I had a table with a class <code>user-forms</code>, and I was checking if any of the checkboxes that had the string <code>checkPrint</code> in their <code>id</code> were unchecked.

blocks|key|2871516|text|这里我有一个关于这个问题的代码片段。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2871517|​|2871518|$(function(){
+++$("#buttoncheck").click(function(){
++++++++if($('[type="checkbox"]').is(":checked")){
++++++++++++$('.checkboxStatus').html("Congratulations!+"%2B$('[type="checkbox"]:checked').length%2B"+checkbox+checked");
++++++++}else{
++++++++++++$('.checkboxStatus').html("Sorry!+Checkbox+is+not+checked");
+++++++++}
+++++++++return+false;
+++})
++++
});|code-block|syntax|javascript|2871519|<script+src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form>
++
++++<label>
++++++<input+type="checkbox"+name="CheckboxGroup1"+value="checkbox"+id="CheckboxGroup1_0">
++++++Checkbox</label>
++++ 
++++<label>
++++++<input+type="checkbox"+name="CheckboxGroup1_"+value="checkbox"+id="CheckboxGroup1_1">
++++++Checkbox</label>
++++ 
++
++
++++<input+type="reset"+value="Reset">
++++<input+type="submit"+id="buttoncheck"+value="Check">
++
++<p+class="checkboxStatus">
</form>|2871520|2871521|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|P|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|K|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|M|$]]

Here I have a snippet for this question.

<div class="snippet" data-lang="js" data-hide="false" data-console="false" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>$(function(){
 $("#buttoncheck").click(function(){
 if($('[type="checkbox"]').is(":checked")){
 $('.checkboxStatus').html("Congratulations! "+$('[type="checkbox"]:checked').length+" checkbox checked");
 }else{
 $('.checkboxStatus').html("Sorry! Checkbox is not checked");
 }
 return false;
 })
 
});</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"&gt;&lt;/script&gt;
&lt;form&gt;
 &lt;p&gt;
 &lt;label&gt;
 &lt;input type="checkbox" name="CheckboxGroup1" value="checkbox" id="CheckboxGroup1_0"&gt;
 Checkbox&lt;/label&gt;
 &lt;br&gt;
 &lt;label&gt;
 &lt;input type="checkbox" name="CheckboxGroup1_" value="checkbox" id="CheckboxGroup1_1"&gt;
 Checkbox&lt;/label&gt;
 &lt;br&gt;
 &lt;/p&gt;
 &lt;p&gt;
 &lt;input type="reset" value="Reset"&gt;
 &lt;input type="submit" id="buttoncheck" value="Check"&gt;
 &lt;/p&gt;
 &lt;p class="checkboxStatus"&gt;&lt;/p&gt;
&lt;/form&gt;</code></pre>
</div>
</div>

blocks|key|223453|text|要像您一样使用.attr()执行此操作，查看是否检查了它，它将是.attr("checked",+"checked")，如果没有，它将是.attr("checked")+==+undefined|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|223454|entityMap^0|7|7|W|R|1W|T|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

To do it with <code>.attr()</code> like you have, to see if it's checked it would be <code>.attr("checked", "checked")</code>, and if it isn't it would be <code>.attr("checked") == undefined</code>

blocks|key|2871512|text|如果在div中选中所有复选框，则返回true|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2871513|function+all_checked+(id_div){
+all_checked+=+true;

+$(id_div%2B'+input[type="checkbox"]').each(function()+{+
++++all_checked+=+all_checked+&&+$('this').prop('checked');
+}

+return+all_checked;
}|code-block|syntax|javascript|2871514|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Return true if all checbox are checked in a div

<pre><code>function all_checked (id_div){
 all_checked = true;

 $(id_div+' input[type="checkbox"]').each(function() { 
 all_checked = all_checked &amp;&amp; $('this').prop('checked');
 }

 return all_checked;
}
</code></pre>

blocks|key|3085410|text|试试这个|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3085411|if+($("#checkSurfaceEnvironment-1:checked").length>0)+{
++++//your+code+in+case+of+NOT+checked
}|code-block|syntax|javascript|3085412|在上面的代码中，通过Id+(#checkSurfaceEnvironment-1)选择元素，然后使用(:checked)+filter过滤掉它的选中状态。|offset|length|style|CODE|3085413|它将返回选中元素对象的数组。如果数组中存在任何对象，则将满足If条件。|3085414|entityMap^0|0|0|D|S|1E|A|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@$I|T|J|U|K|L]|$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|P|$]]

try this one

<pre><code>if ($("#checkSurfaceEnvironment-1:checked").length&gt;0) {
 //your code in case of NOT checked
}
</code></pre>

In Above code selecting the element by Id <code>(#checkSurfaceEnvironment-1)</code> then filter out it's checked state by <code>(:checked)</code> filter.

It will return array of checked element object. If there any object exists in the array then if condition will be satisfied.

blocks|key|218577|text|简单易查或未查到的情况|type|unstyled|depth|inlineStyleRanges|entityRanges|data|218578|<input+type="checkbox"+id="ev-click"+name=""+value=""+>

<script>
++++$(+"#ev-click"+).click(function()+{
++++++++if(this.checked){
++++++++++++alert('checked');
++++++++}
++++++++if(!this.checked){
++++++++++++alert('Unchecked');
++++++++}
++++});
</script>|code-block|syntax|javascript|218579|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Simple and easy to check or unchecked condition

<pre><code>&lt;input type="checkbox" id="ev-click" name="" value="" &gt;

&lt;script&gt;
 $( "#ev-click" ).click(function() {
 if(this.checked){
 alert('checked');
 }
 if(!this.checked){
 alert('Unchecked');
 }
 });
&lt;/script&gt;
</code></pre>

blocks|key|221612|text|有两种方法可以检查条件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|221613|if+($("#checkSurfaceEnvironment-1").is(":checked"))+{
++++//+Put+your+code+here+if+checkbox+is+checked
}|code-block|syntax|javascript|221614|或者你也可以使用这个|221615|if($("#checkSurfaceEnvironment-1").prop('checked')+==+true){
++++//+Put+your+code+here+if+checkbox+is+checked
}|221616|我希望这对你有用。|221617|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

There are two way you can check condition.

<pre><code>if ($("#checkSurfaceEnvironment-1").is(":checked")) {
 // Put your code here if checkbox is checked
}
</code></pre>

OR you can use this one also

<pre><code>if($("#checkSurfaceEnvironment-1").prop('checked') == true){
 // Put your code here if checkbox is checked
}
</code></pre>

I hope this is useful for you.

blocks|key|3085468|text|这里的是给定的最简单方法|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3085469|+<script+type="text/javascript">

++++++++$(document).ready(function+()+{
++++++++++++$("#chk_selall").change("click",+function+()+{

++++++++++++++++if+(this.checked)
++++++++++++++++{
++++++++++++++++++++//do+something
++++++++++++++++}
++++++++++++++++if+(!this.checked)
++++++++++++++++{
++++++++++++++++++++//do+something

++++++++++++++++}

++++++++++++});

++++++++});

++++</script>|code-block|syntax|javascript|3085470|entityMap^0|3|3|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Here is the simplest way given

<pre><code> &lt;script type="text/javascript"&gt;

 $(document).ready(function () {
 $("#chk_selall").change("click", function () {

 if (this.checked)
 {
 //do something
 }
 if (!this.checked)
 {
 //do something

 }

 });

 });

 &lt;/script&gt;
</code></pre>

blocks|key|3085425|text|我使用了这个，并且为我工作！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3085426|$("checkbox+selector").click(function()+{
++++if($(this).prop('checked')==true){
+++++++do+what+you+need!
++++}
});|code-block|syntax|javascript|3085427|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I used this and in worked for me!

<pre><code>$("checkbox selector").click(function() {
 if($(this).prop('checked')==true){
 do what you need!
 }
});
</code></pre>

blocks|key|2871683|text|我知道这个问题已经得到了回答，但这仍然是一个很好的方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2871684|if+($("#checkbox").is(":checked")==false)+{
++++//Do+stuff+here+like:+$(".span").html("Lorem");
}|code-block|syntax|javascript|2871685|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I know this has already been answered, but still, this is a good way to do it: 

<pre><code>if ($("#checkbox").is(":checked")==false) {
 //Do stuff here like: $(".span").html("&lt;span&gt;Lorem&lt;/span&gt;");
}
</code></pre>

blocks|key|218629|text|if($("#checkbox1").prop('checked')+==+false){
++++alert('checkbox+is+not+checked');
++++//do+something
}
else
{+
++++alert('checkbox+is+checked');
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|218630|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>if($("#checkbox1").prop('checked') == false){
 alert('checkbox is not checked');
 //do something
}
else
{ 
 alert('checkbox is checked');
}
</code></pre>

blocks|key|223583|text|$("#chkFruits_0,#chkFruits_1,#chkFruits_2,#chkFruits_3,#chkFruits_4").change(function+()+{
++++++++var+item+=+$("#chkFruits_0,#chkFruits_1,#chkFruits_2,#chkFruits_3,#chkFruits_4");
++++if+(item.is(":checked")==true)+{
++++++++//execute+your+code+here
++++}

++++else+if+(item.is(":not(:checked)"))
++++{
++++++++//execute+your+code+here
++++}

});|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|223584|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>$("#chkFruits_0,#chkFruits_1,#chkFruits_2,#chkFruits_3,#chkFruits_4").change(function () {
 var item = $("#chkFruits_0,#chkFruits_1,#chkFruits_2,#chkFruits_3,#chkFruits_4");
 if (item.is(":checked")==true) {
 //execute your code here
 }

 else if (item.is(":not(:checked)"))
 {
 //execute your code here
 }

});
</code></pre>

I'm having trouble figuring this out. I have two checkboxes (in the future will have more):

<ul>
<li><code>checkSurfaceEnvironment-1</code></li>
<li><code>checkSurfaceEnvironment-2</code></li>
</ul>

Basically, I want to write an if statement and test if one of them is checked and another is NOT checked. What's the easiest way to accomplish the following:

<pre class="lang-js prettyprint-override"><code>if ( $("#checkSurfaceEnvironment-1").attr('checked', true) &amp;&amp;
 $("#checkSurfaceEnvironment-2").is('**(NOT??)** :checked') ) {
 // do something
}
</code></pre>

jQuery: Test if checkbox is NOT checked

jQuery

我很难弄清楚这件事。我有两个复选框(将来会有更多)：checkSurfaceEnvironment-1checkSurfaceEnvironment-2基本上，我想要编写一个if语句，并测试其中一个是否被选中，另一个是否被选中。完成以下任务的最简单方法是什么：if ( $("#checkSurfaceEnvironment-1").attr('checked', true) &&     $("#

问jQuery:未选中复选框时进行测试
EN

回答 18

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回答 18

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