我有一个Javascript（dojo）函数，用来自动填充表单，其思想是传入一个JS对象，其中包含表单字段id的键和帮助定义如何填充字段的值。
它可以工作，但是我觉得有点难看（switch语句，对象语法中的对象）。有什么想法可以改进 * 这段代码吗？

/**
 * Fill in the form with passed in values
 *
 * @param {Object} defaults 
 *
 * Can be used to pass in default values to the form. Expects an object like this:
 *      {<field id>: {type: '<field type>', value:'<value>'}
 *
 *      for example:
 *      {
 *      paymethod: {type: 'select', value:'Account Transfer'},   // html select
 *      fundsource: {type: 'combo', value:'Corporation Account'} // dijit.comboBox
 *      }
 */
function fillDefaults(defaults) {
    var props;
    for (var field in defaults) {
        props = defaults[field];
        switch (props['type']) {
            // so far only select and combo have been implemented 
            // others will be added as needed
            // and maybe grouped depending on how they work 
            // (e.g. all dijits together, <input> with <select>, etc.)
            case 'select':
                dojo.byId(field).value = props['value'];
                dojo.byId(field).onchange()
                break;
            case 'combo':
                dijit.byId(field).attr('value', props['value']);
                break;
        }
    }
}

[*]改善：让它更漂亮，更像js，更像dojo，更流线型