let bb:boolean = false; let aa:number = 10; bb = aa==8; //相等 bb = aa>8; //大于 bb = aa<8; //小于 bb = aa>=8; //大于等于 bb = aa<=8; //小于等于 bb = aa<8 && aa==5; //且 bb = aa<8 || aa==5; //或 bb = !false; //非