JS output diamond on the console

js Output diamond on the console

With a top half 10 That's ok , The second part of 9 Line as an example

		var str = "";                                 // String splicing shall be adopted for console output , So first define an empty string 
        for (var row = 1; row <= 10; row++) {         // The outer loop controls the number of lines , First output the top half 10 That's ok 

            for (var j = 1; j <= 10 - row; j++) {     // Because the first line has 9 A space , 1 A star . In order to be more straightforward , use @ Replace spaces 
                str = str + "@"                       // Because the second line has 8 A space , 3 A star 
            }                                         // Because the third line has 7 A space , 5 A star 
                                                      // Because the fourth line has 6 A space , 7 A star 
                                                      // ...........
                                                      // Because the tenth line has 0 A space ,19 A star 
                                                      // So the relationship between spaces and the number of lines is :j<=(10-row)

            for (var i = 1; i <= 2 * row - 1; i++) {  // The relationship between stars and the number of rows is :(2*row-1)
                str = str + "*";
            }

            str = str + "\n";                         // The outer loop , Every output line should be wrapped 
        }


        // The lower half is roughly the same as the upper half 
        for (var row = 1; row <= 9; row++) {          // The outer loop controls the number of lines , Output the lower half of 9 That's ok 

            for (var j = 1; j <= row; j++) {          // Because the first line has 1 A space ,17 A star 
                str = str + "@"                       // Because the second line has 1 A space ,15 A star 
            }                                         // Because the third line has 1 A space ,13 A star 
                                                      // Because the fourth line has 1 A space ,11 A star 
                                                      //...............
                                                      // Because the first line has 9 A space , 1 A star 
                                                      // So the relationship between spaces and the number of lines is :j<=row

            for (var i = 1; i <= 19 - 2 * row; i++) {  // The relationship between stars and the number of rows is the total number of rows 19 subtract 2 Times row namely :19-2*row  
                str = str + "*";                       
            }

            str = str + "\n";                           // The outer loop , Every output line should be wrapped 
        }
        console.log(str);

I copied it directly , ha-ha ！ For your reference ！
See both , Good luck ！
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