我想,根据参数值,控制两个按钮控件的显示.参数是这样写的吗$level

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var city = this.options.form.getWidgetByName("一键展开_c");

var thislen = '$level';

if (thislen <= 10) {

city.setVisible(true);

this.options.form.getWidgetByName("一键展开_c").setVisible(true);

} else {

city.setVisible(false);

this.options.form.getWidgetByName("一键展开_c").setVisible(false);

}