JavaScript loop practice method of printing triangles, factorials, and multiplication tables

( i = 1 ; i <= 3 ; i++( x = 1; x <= i; x++&#39;*&#39;&#39;<br>&#39;

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Find the sum of factorials 1! +2! +3! +4! +...+N!

 n=prompt(&#39;输入&#39; sum=0( x = 1;x <=n ; x++ factorial=1( y=1; y <= x; y++*=factorial（y-1）*y

rrree

9*9 multiplication table printing

+=

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