九九乘法表在js中编程

九九乘法表在js中编程

for(var j=1; j<=9;j++){
        var result = "";
        for(var i=1;i<=j;i++){
                result +=(i+"*"+j+" = "+i*j+(i*j>9?" ":"  "));

        } 
        console.log(result);
}   
console.log("第2个");
for(var j=9; j>=1;j--){
        var result = "";
        for(var i=1;i<=j;i++){
                result +=(i+"*"+j+" = "+i*j+(i*j>9?" ":"  "));
        }
        console.log(result);
}


console.log("第3个");
for(var j=1; j<=9;j++){
        var result = "";


        for(var i=9;i>0;i--){
                if(i>j){
                        result +="         ";
                }else{
                result +=(i+"*"+j+" = "+i*j+(i*j>9?" ":"  "));
                }
        }
        console.log(result);
}


console.log("第4个");

for(var j=9; j>=0;j--){
        var result = "";
	

        for(var i=9;i>0;i--){
		if(i>j){
			result +="         ";
		}else{
                result +=(i+"*"+j+" = "+i*j+(i*j>9?" ":"  "));
		}
        }
        console.log(result);
}