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js limits the number of checkbox selections, taking the limit to six as an example_javascript skills

WBOYOriginal: 2016-05-16 16:42:001145browse

When I was working on a project today, I encountered a problem. I needed to display multiple checkboxes, but only up to 6 could be selected. After debugging for a long time, it finally came out. The code is as follows:

<SCRIPT LANGUAGE="JavaScript"> 
var c=0,limit=6; 
function doCheck(obj) { 
obj.checked&#63;c++:c--; 
if(c>limit){ 
obj.checked=false; 
alert("over"); 
c--; 
} 
} 
</SCRIPT> 
<html> 
<body> 
<input type="CHECKBOX" name="sample1" onClick="doCheck(this)">A 
<input type="CHECKBOX" name="sample2" onClick="doCheck(this)">B 
<input type="CHECKBOX" name="sample3" onClick="doCheck(this)">C 
<input type="CHECKBOX" name="sample4" onClick="doCheck(this)">D 
<input type="CHECKBOX" name="sample5" onClick="doCheck(this)">E 
<input type="CHECKBOX" name="sample6" onClick="doCheck(this)">F 
<input type="CHECKBOX" name="sample7" onClick="doCheck(this)">G 
<input type="CHECKBOX" name="sample8" onClick="doCheck(this)">H 
<input type="CHECKBOX" name="sample9" onClick="doCheck(this)">I 
<input type="CHECKBOX" name="sample10" onClick="doCheck(this)">J 
</body> 
</html>

The display results are as follows:

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js limits the number of checkbox selections, taking the limit to six as an example_javascript skills

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