测试一些参数是否为函数

 
<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 () { 
    function stub() {}
    var objs = [
        function() {},
        { x:15, y:20 },
        null,
        stub,
        "function"
    ];
    $.each( objs, function( i ) {
        var isFunc = $.isFunction( objs[ i ]);
        $( "span" ).eq( i ).text( isFunc );
    });
})
</script>