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Example code about jQuery method output

零下一度
零下一度Original
2017-06-29 13:43:451145browse

Each time a multi-select box is selected, output how many are selected

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script src="js/jquery.1.1.1.js?1.1.11">
</script><script> $(function () {             
function countChecked() {var n=$("#form1 input[type=checkbox]:checked").length;
                
                $("div:first").html("有"+n+"个checkbox被选中");
            }
            $("#form1 input[type=checkbox]").click(countChecked);//每选一个框调用一次函数，不带括号
         })
         </script></head><body><form action="" id="form1">
         <input type="checkbox" name="newsletter" checked="checked" value="test1" />
         test1<input type="checkbox" name="newsletter" value="test2" />
         test2<input type="checkbox" name="newsletter" value="test3" />
         test3<input type="checkbox" name="newsletter" checked="checked" value="test4" />
         test4<input type="checkbox" name="newsletter" value="test5" />
         test5<div>
         </div>
         </form>
         </body>
         </html>

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