var a=1;
		    while(a<=9){
		        var b=1;
		        while(b<=a){
		            if(b==2&&(a==4||a==3)){
		                document.write(a+"*"+b+"="+b*a+"  ");
		            }else{
		                document.write(a+"*"+b+"="+b*a+" ");
		            }
		            
		            b++;
		        }
		        document.write("换行");
		        a++;    
		    }