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MIP.watch('step',function(newVal,oldVal){ if(newVal === 1) { MIP.setData({ coin1: zhibi() ? '正' : '反' }) } else if(newVal === 2) { MIP.setData({ coin2: zhibi() ? '正' : '反' }) } }) function zhibi() { var num = Math.floor(Math.random() * 10); return num % 2 == 0; }