示例：

<div id="background_color" class="input-group colorpicker-component">
    <input type="text" id="input-background_color" name="background_color" value="#00AABB" class="form-control" />
    <span class="input-group-addon"><i></i></span>
</div>
<script>
    $(function() {
        $('#background_color').colorpicker().on('changeColor',function (ev){
            $('#preIFrame').contents().find("#top").css({background:$(this).colorpicker('getValue', '#ffffff')})
        });
    });
</script>