<永洪tech>表格上面，默认显示5行，三秒后展示下面的5行

加载时脚本：
param['x']
变化时：
param['x']=param['x']-1
if(param['x'] > 0){
param['a']=20-5*param['x']
param['b']=20-5*(param['x']-1)
}else {
param['x']=5
param['x']=param['x']-1
param['a']=20-5*param['x']
param['b']=20-5*(param['x']-1)
}