当参数等于1是,t.ycrq小于等于参数sj2,否则=参数sj2
${if(yc==1,left(t.ycrq,7)<=left('"+sj2+"',7),.......)}
缺少=号,条件前加AND
${if(yc==1,AND left(t.ycrq,7)<=left('"+sj2+"',7), AND left(t.ycrq,7)=left('"+sj2+"',7),)}