blocks|key|2865992|text|如果您打算引用两个复选框(如document.FC.c1+)，则应避免使用两个同名的复选框。如果你有多个名为c1的复选框，浏览器怎么知道你指的是哪一个呢？|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2865993|下面是一个非jQuery解决方案，用于检查是否选中了页面上的任何复选框。|2865994|var+checkboxes+=+document.querySelectorAll('input[type="checkbox"]');
var+checkedOne+=+Array.prototype.slice.call(checkboxes).some(x+=>+x.checked);|code-block|syntax|javascript|2865995|您需要Array.prototype.slice.call部件将document.querySelectorAll返回的NodeList转换为可对其调用some的数组。|2865996|entityMap^0|E|E|1I|2|0|0|0|3|Q|W|P|1O|8|24|4|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|W|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|X|8|@$9|Y|A|Z|B|C]|$9|10|A|11|B|C]|$9|12|A|13|B|C]|$9|14|A|15|B|C]]|D|@]|E|$]]|$1|O|3|-4|5|6|7|16|8|@]|D|@]|E|$]]]|P|$]]

<p>You should avoid having two checkboxes with the same name if you plan to reference them like <code>document.FC.c1</code>.  If you have multiple checkboxes named <code>c1</code> how will the browser know which you are referring to?</p>

<p>Here's a non-jQuery solution to check if any checkboxes on the page are checked.</p>

<pre><code>var checkboxes = document.querySelectorAll('input[type="checkbox"]');
var checkedOne = Array.prototype.slice.call(checkboxes).some(x =&gt; x.checked);
</code></pre>

<p>You need the <code>Array.prototype.slice.call</code> part to convert the <code>NodeList</code> returned by <code>document.querySelectorAll</code> into an array that you can call <code>some</code> on.</p>


blocks|key|2866002|text|Check+this.|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2866003|您不能通过表单输入的名称访问表单输入。请改用document.getElements方法。|style|CODE|2866004|entityMap|0|LINK|mutability|MUTABLE|url|http://jsfiddle.net/qyE97/^0|0|B|0|0|M|K|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@$A|U|B|V|F|G]]|9|@]|C|$]]|$1|H|3|-4|5|6|7|W|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]]]

<p><a href="http://jsfiddle.net/qyE97/" rel="nofollow">Check this.</a></p>

<p>You can't access form inputs via their name. Use <code>document.getElements</code> methods instead.</p>


blocks|key|218777|text|防止用户取消选中上次选中的复选框。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|218778|jQuery+(原始答案)。|218779|$('input[type="checkbox"][name="chkBx"]').on('change',function(){
++++var+getArrVal+=+$('input[type="checkbox"][name="chkBx"]:checked').map(function(){
++++++++return+this.value;
++++}).toArray();

++++if(getArrVal.length){
++++++++//execute+the+code
++++++++$('#msg').html(getArrVal.toString());

++++}+else+{
++++++++$(this).prop("checked",true);
++++++++$('#msg').html("At+least+one+value+must+be+checked!");
++++++++return+false;

++++}
});|code-block|syntax|javascript|218780|更新答案2019-05-31|offset|length|style|BOLD|218781|普通JS|218782|​|218783|let+i,
++++el+=+document.querySelectorAll('input[type="checkbox"][name="chkBx"]'),
++++msg+=+document.getElementById('msg'),
++++onChange+=+function(ev){
++++++++ev.preventDefault();
++++++++let+_this+=+this,
++++++++++++arrVal+=+Array.prototype.slice.call(
++++++++++++++++document.querySelectorAll('input[type="checkbox"][name="chkBx"]:checked'))
++++++++++++++++++++.map(function(cur){return+cur.value});

++++++++if(arrVal.length){
++++++++++++msg.innerHTML+=+JSON.stringify(arrVal);
++++++++}+else+{
++++++++++++_this.checked=true;
++++++++++++msg.innerHTML+=+"At+least+one+value+must+be+checked!";
++++++++}
++++};

for(i=el.length;i--;){el[i].addEventListener('change',onChange,false);}|218784|<label><input+type="checkbox"+name="chkBx"+value="value1"+checked>+Value1</label>
<label><input+type="checkbox"+name="chkBx"+value="value2">+Value2</label>
<label><input+type="checkbox"+name="chkBx"+value="value3">+Value3</label>
<div+id="msg"></div>|218785|218786|entityMap^0|0|0|0|0|E|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|11|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|12|8|@$K|13|L|14|M|N]]|9|@]|A|$]]|$1|O|3|P|5|6|7|15|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|16|8|@]|9|@]|A|$]]|$1|S|3|T|5|F|7|17|8|@]|9|@]|A|$G|H]]|$1|U|3|V|5|F|7|18|8|@]|9|@]|A|$G|H]]|$1|W|3|R|5|6|7|19|8|@]|9|@]|A|$]]|$1|X|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|Y|$]]

<p>Prevent user from deselecting last checked checkbox.<br>
jQuery (original answer).</p>

<pre><code>$('input[type="checkbox"][name="chkBx"]').on('change',function(){
    var getArrVal = $('input[type="checkbox"][name="chkBx"]:checked').map(function(){
        return this.value;
    }).toArray();

    if(getArrVal.length){
        //execute the code
        $('#msg').html(getArrVal.toString());

    } else {
        $(this).prop("checked",true);
        $('#msg').html("At least one value must be checked!");
        return false;

    }
});
</code></pre>

<p><strong>UPDATED ANSWER 2019-05-31</strong><br>
Plain JS</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>let i,
    el = document.querySelectorAll('input[type="checkbox"][name="chkBx"]'),
    msg = document.getElementById('msg'),
    onChange = function(ev){
        ev.preventDefault();
        let _this = this,
            arrVal = Array.prototype.slice.call(
                document.querySelectorAll('input[type="checkbox"][name="chkBx"]:checked'))
                    .map(function(cur){return cur.value});

        if(arrVal.length){
            msg.innerHTML = JSON.stringify(arrVal);
        } else {
            _this.checked=true;
            msg.innerHTML = "At least one value must be checked!";
        }
    };

for(i=el.length;i--;){el[i].addEventListener('change',onChange,false);}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;label&gt;&lt;input type="checkbox" name="chkBx" value="value1" checked&gt; Value1&lt;/label&gt;
&lt;label&gt;&lt;input type="checkbox" name="chkBx" value="value2"&gt; Value2&lt;/label&gt;
&lt;label&gt;&lt;input type="checkbox" name="chkBx" value="value3"&gt; Value3&lt;/label&gt;
&lt;div id="msg"&gt;&lt;/div&gt;</code></pre>
</div>
</div>
</p>


blocks|key|218378|text|<+script+type+=+"text/javascript"+src+=+"js/jquery-1.6.4.min.js"+>++<++/+script+>
+++++<+script+type+=+"text/javascript"+>

function+checkSelectedAtleastOne(clsName)+{
++++if+(selectedValue+==+"select")
++++++++return+false;

++++var+i+=+0;
++++$("."+%2B+clsName).each(function+()+{

++++++++if+($(this).is(':checked'))+{
++++++++++++i+=+1;
++++++++}

++++});

++++if+(i+==+0)+{
++++++++alert("Please+select+atleast+one+users");
++++++++return+false;
++++}+else+if+(i+==+1)+{
++++++++return+true;
++++}

++++return+true;

}

$(document).ready(function+()+{
++++$('#chkSearchAll').click(function+()+{

++++++++var+checked+=+$(this).is(':checked');
++++++++$('.clsChkSearch').each(function+()+{
++++++++++++var+checkBox+=+$(this);
++++++++++++if+(checked)+{
++++++++++++++++checkBox.prop('checked',+true);
++++++++++++}+else+{
++++++++++++++++checkBox.prop('checked',+false);
++++++++++++}
++++++++});

++++});

++++//for+select+and+deselect+'select+all'+check+box+when+clicking+individual+check+boxes
++++$(".clsChkSearch").click(function+()+{

++++++++var+i+=+0;
++++++++$(".clsChkSearch").each(function+()+{

++++++++++++if+($(this).is(':checked'))+{}
++++++++++++else+{

++++++++++++++++i+=+1;+//unchecked
++++++++++++}

++++++++});

++++++++if+(i+==+0)+{
++++++++++++$("#chkSearchAll").attr("checked",+true)
++++++++}+else+if+(i+==+1)+{

++++++++++++$("#chkSearchAll").attr("checked",+false)
++++++++}

++++});

});

<++/+script+>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|218379|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>&lt; script type = "text/javascript" src = "js/jquery-1.6.4.min.js" &gt;  &lt;  / script &gt;
     &lt; script type = "text/javascript" &gt;

function checkSelectedAtleastOne(clsName) {
    if (selectedValue == "select")
        return false;

    var i = 0;
    $("." + clsName).each(function () {

        if ($(this).is(':checked')) {
            i = 1;
        }

    });

    if (i == 0) {
        alert("Please select atleast one users");
        return false;
    } else if (i == 1) {
        return true;
    }

    return true;

}

$(document).ready(function () {
    $('#chkSearchAll').click(function () {

        var checked = $(this).is(':checked');
        $('.clsChkSearch').each(function () {
            var checkBox = $(this);
            if (checked) {
                checkBox.prop('checked', true);
            } else {
                checkBox.prop('checked', false);
            }
        });

    });

    //for select and deselect 'select all' check box when clicking individual check boxes
    $(".clsChkSearch").click(function () {

        var i = 0;
        $(".clsChkSearch").each(function () {

            if ($(this).is(':checked')) {}
            else {

                i = 1; //unchecked
            }

        });

        if (i == 0) {
            $("#chkSearchAll").attr("checked", true)
        } else if (i == 1) {

            $("#chkSearchAll").attr("checked", false)
        }

    });

});

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


blocks|key|3079508|text|Vanilla+JS:|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3079509|var+checkboxes+=+document.getElementsByClassName('activityCheckbox');+//+puts+all+your+checkboxes+in+a+variable

function+activitiesReset()+{
++++var+checkboxesChecked+=+function+()+{+//+if+a+checkbox+is+checked,+function+ends+and+returns+true.+If+all+checkboxes+have+been+iterated+through+(which+means+they+are+all+unchecked),+returns+false.
++++++++for+(var+i+=+0;+i+<+checkboxes.length;+i%2B%2B)+{
++++++++++++if+(checkboxes[i].checked)+{
++++++++++++++++return+true;
++++++++++++}
++++++++}
++++++++return+false;
++++}
++++error[2].style.display+=+'none';+//+an+array+item+specific+to+my+project+-+it's+a+red+label+which+says+'Please+check+a+checkbox!'.+Here+its+display+is+set+to+none,+so+the+initial+non-error+label+is+visible+instead.+
++++++++if+(submitCounter+>+0+&&+checkboxesChecked()+===+false)+{+//+if+a+form+submit+has+been+attempted,+and+if+all+checkboxes+are+unchecked
++++++++++++error[2].style.display+=+'block';+//+red+error+label+is+now+visible.
++++++++}
}

for+(var+i=0;+i<checkboxes.length;+i%2B%2B)+{++//+whenever+a+checkbox+is+checked+or+unchecked,+activitiesReset+runs.
++++checkboxes[i].addEventListener('change',+activitiesReset);
}|code-block|syntax|javascript|3079510|说明：|3079511|一旦尝试了表单提交，这将更新复选框部分的标签，以通知用户如果他/她还没有选中复选框。如果未选中任何复选框，则会显示一个隐藏的“错误”标签，提示用户“请选中一个复选框！”如果用户选中至少一个复选框，红色标签会立即再次隐藏，显示原始标签。如果用户再次取消选中所有复选框，则红色标签将实时返回。这是由JavaScript的onchange事件(编写为.addEventListener('change',+function(){});+)实现的|CODE|3079512|entityMap^0|0|B|0|0|0|3|0|4E|8|4S|16|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|U|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|Y|8|@$9|Z|A|10|B|O]|$9|11|A|12|B|O]]|D|@]|E|$]]|$1|P|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|Q|$]]

<p><strong>Vanilla JS:</strong></p>

<pre><code>var checkboxes = document.getElementsByClassName('activityCheckbox'); // puts all your checkboxes in a variable

function activitiesReset() {
    var checkboxesChecked = function () { // if a checkbox is checked, function ends and returns true. If all checkboxes have been iterated through (which means they are all unchecked), returns false.
        for (var i = 0; i &lt; checkboxes.length; i++) {
            if (checkboxes[i].checked) {
                return true;
            }
        }
        return false;
    }
    error[2].style.display = 'none'; // an array item specific to my project - it's a red label which says 'Please check a checkbox!'. Here its display is set to none, so the initial non-error label is visible instead. 
        if (submitCounter &gt; 0 &amp;&amp; checkboxesChecked() === false) { // if a form submit has been attempted, and if all checkboxes are unchecked
            error[2].style.display = 'block'; // red error label is now visible.
        }
}

for (var i=0; i&lt;checkboxes.length; i++) {  // whenever a checkbox is checked or unchecked, activitiesReset runs.
    checkboxes[i].addEventListener('change', activitiesReset);
}
</code></pre>

<p><br/><strong>Explanation:</strong><br/>
Once a form submit has been attempted, this will update your checkbox section's label to notify the user to check a checkbox if he/she hasn't yet. If no checkboxes are checked, a hidden 'error' label is revealed prompting the user to 'Please check a checkbox!'. If the user checks at least one checkbox, the red label is instantaneously hidden again, revealing the original label. If the user again un-checks all checkboxes, the red label returns in real-time. This is made possible by JavaScript's <code>onchange</code> event (written as <code>.addEventListener('change', function(){});</code></p>


blocks|key|2866082|text|您可以使用这段简单的代码检查是否至少选中了一个复选框。您也可以删除您的邮件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2866083|参考Link|offset|length|2866084|<label+class="control-label+col-sm-4">Check+Box+2</label>
++++<input+type="checkbox"+name="checkbox2"+id="checkbox2"+value=ck1+/>+ck1<br+/>
++++<input+type="checkbox"+name="checkbox2"+id="checkbox2"+value=ck2+/>+ck2<br+/>

<script>
function+checkFormData()+{
++++if+(!$('input[name=checkbox2]:checked').length+>+0)+{
++++++++document.getElementById("errMessage").innerHTML+=+"Check+Box+2+can+not+be+null";
++++++++return+false;
++++}
++++alert("Success");
++++return+true;
}
</script>|code-block|syntax|javascript|2866085|entityMap|0|LINK|mutability|MUTABLE|url|http://34codefactory.blogspot.in/2017/12/at-least-one-checkbox-is-checked-from.html^0|0|2|4|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@$D|U|E|V|1|W]]|A|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

<p>You can check that atleast one checkbox is checked or not using this simple code. You can also drop your message.</p>

<p>Reference <a href="http://34codefactory.blogspot.in/2017/12/at-least-one-checkbox-is-checked-from.html" rel="nofollow noreferrer">Link</a></p>

<pre><code>&lt;label class="control-label col-sm-4"&gt;Check Box 2&lt;/label&gt;
    &lt;input type="checkbox" name="checkbox2" id="checkbox2" value=ck1 /&gt; ck1&lt;br /&gt;
    &lt;input type="checkbox" name="checkbox2" id="checkbox2" value=ck2 /&gt; ck2&lt;br /&gt;

&lt;script&gt;
function checkFormData() {
    if (!$('input[name=checkbox2]:checked').length &gt; 0) {
        document.getElementById("errMessage").innerHTML = "Check Box 2 can not be null";
        return false;
    }
    alert("Success");
    return true;
}
&lt;/script&gt;
</code></pre>


blocks|key|218424|text|if(($("#checkboxid1").is(":checked"))+%7C%7C+($("#checkboxid2").is(":checked"))
++++++++++++%7C%7C+($("#checkboxid3").is(":checked")))+{
+//Your+Code+here
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|218425|您可以使用此代码来验证是否至少选中了一个复选框。|unstyled|218426|谢谢！！|218427|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code>if(($("#checkboxid1").is(":checked")) || ($("#checkboxid2").is(":checked"))
            || ($("#checkboxid3").is(":checked"))) {
 //Your Code here
}
</code></pre>

<p>You can use this code to verify that checkbox is checked at least one.</p>

<p>Thanks!!</p>


blocks|key|3079672|text|我会选择一种更实用的方法。自从ES6以来，我们已经有了这么好的工具来解决我们的问题，所以为什么不使用它们呢？让我们首先给复选框一个类，这样我们就可以很好地将它们四舍五入。我更喜欢使用类而不是inputtype="checkbox“，因为现在的解决方案更加通用，并且当您的文档中有更多组的checkbox时也可以使用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3079673|HTML|3079674|++++<input+type="checkbox"+class="checkbox"+value=ck1+/>+ck1<br+/>
++++<input+type="checkbox"+class="checkbox"+value=ck2+/>+ck2<br+/>|code-block|syntax|javascript|3079675|JavaScript|3079676|function+atLeastOneCheckboxIsChecked(){
++++const+checkboxes+=+Array.from(document.querySelectorAll(".checkbox"));
++++return+checkboxes.reduce((acc,+curr)+=>+acc+%7C%7C+curr.checked,+false);
}|3079677|调用时，如果未选中任何复选框，则函数将返回false；如果一个复选框或两个复选框都选中，则返回true。|3079678|它的工作原理如下，reducer函数有两个参数，累加器(acc)和当前值(curr)。对于数组上的每次迭代，如果累加器或当前值为true，则缩减程序将返回true。上一次迭代的返回值是当前迭代的累加器，因此，如果它为真，它将一直保持为真直到结束。|3079679|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

<p>I would opt for a more functional approach. Since ES6 we have been given such nice tools to solve our problems, so why not use them.
Let's begin with giving the checkboxes a class so we can round them up very nicely.
I prefer to use a class instead of input[type="checkbox"] because now the solution is more generic and can be used also when you have more groups of checkboxes in your document.</p>

<p>HTML</p>

<pre class="lang-html prettyprint-override"><code>    &lt;input type="checkbox" class="checkbox" value=ck1 /&gt; ck1&lt;br /&gt;
    &lt;input type="checkbox" class="checkbox" value=ck2 /&gt; ck2&lt;br /&gt;

</code></pre>

<p>JavaScript</p>

<pre class="lang-js prettyprint-override"><code>function atLeastOneCheckboxIsChecked(){
    const checkboxes = Array.from(document.querySelectorAll(".checkbox"));
    return checkboxes.reduce((acc, curr) =&gt; acc || curr.checked, false);
}
</code></pre>

<p>When called, the function will return false if no checkbox has been checked and true if one or both is.</p>

<p>It works as follows, the reducer function has two arguments, the accumulator (acc) and the current value (curr). For every iteration over the array, the reducer will return true if either the accumulator or the current value is true.
the return value of the previous iteration is the accumulator of the current iteration, therefore, if it ever is true, it will stay true until the end.</p>


<p>I have a form with multiple checkboxes and I want to use JavaScript to make sure at least one is checked. This is what I have right now but no matter what is chosen an alert pops up.</p>

<blockquote>
  <p>JS (wrong)</p>
</blockquote>

<pre><code>function valthis(){
 if (document.FC.c1.checked) {
   alert ("thank you for checking a checkbox")
  } else  {
   alert ("please check a checkbox")
  }
}
</code></pre>

<blockquote>
  <p>HTML</p>
</blockquote>

<pre><code>&lt;p&gt;Please select at least one Checkbox&lt;/p&gt;
&lt;br&gt;
&lt;br&gt;
&lt;form name = "FC"&gt;
&lt;input type = "checkbox" name = "c1" value = "c1"/&gt; C1 
&lt;br&gt;
&lt;input type = "checkbox" name = "c1" value = "c2"/&gt; C2
&lt;br&gt;
&lt;input type = "checkbox" name = "c1" value = "c3"/&gt; C3
&lt;br&gt; 
&lt;input type = "checkbox" name = "c1" value = "c4"/&gt; C4 
&lt;br&gt;
&lt;/form&gt;
&lt;br&gt;
&lt;br&gt;

&lt;input type = "button" value = "Edit and Report" onClick = "valthisform();"&gt;
</code></pre>

<blockquote>
  <p>So what I ended up doing in JS was this:</p>
</blockquote>

<pre><code>function valthisform(){
 var chkd = document.FC.c1.checked || document.FC.c2.checked||document.FC.c3.checked|| document.FC.c4.checked

 if (chkd == true){

 } else {
    alert ("please check a checkbox")
 }

}
</code></pre>

<p>I decided to drop the "Thank you" part to fit in with the rest of the assignment. Thank you so much, every ones advice really helped out. </p>


Making sure at least one checkbox is checked

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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