layui下拉选选项格式为key-value，选中回显格式设置为value

Question

layui.use(['form'], function () {
    var form = layui.form;
    //选中事件
    form.on('select',function(data){
        var selData = $(this).text()
        var res = selData.split('-')
        var inputVal = $(this).parent().siblings('.layui-select-title').children('.layui-input')
        inputVal.val(res[1])
    });
    form.render('select');//刷新select
});

选中后实现了value赋值，但是重新选择或者点击别处又会恢复code-value的格式，请问该怎么解决