返回值:booleanjQuery.isFunction(obj)

Determine if the argument passed is a Javascript function object.

Note: As of jQuery 1.3, functions provided by the browser like alert() and DOM element methods like getAttribute() are not guaranteed to be detected as functions in browsers such as Internet Explorer.

示例:

Test a few parameter examples.

<!DOCTYPE html>
<html>
<head>
<style>
  div { color:blue; margin:2px; font-size:14px; }
  span { color:red; }
  </style>
<script src="jquery.min.js"></script>
</head>
<body>


  <div>jQuery.isFunction(objs[0]) = <span></span></div>

  <div>jQuery.isFunction(objs[1]) = <span></span></div>
  <div>jQuery.isFunction(objs[2]) = <span></span></div>
  <div>jQuery.isFunction(objs[3]) = <span></span></div>

  <div>jQuery.isFunction(objs[4]) = <span></span></div>
  

<script>


    function stub() {
    }
    var objs = [
          function () {},
          { x:15, y:20 },
          null,
          stub,
          "function"
        ];

    jQuery.each(objs, function (i) {
      var isFunc = jQuery.isFunction(objs[i]);
      $("span").eq(i).text(isFunc);
    });


</script>
</body>
</html>
演示:

示例:

Finds out if the parameter is a funcion.

jQuery 代码:
$.isFunction(function(){});
结果:
true