JS output data accurate to the decimal point n-bit code _javascript tips

Write two methods, you can output data num accurate to the decimal point after the nth bit, the specific contents are as follows

1. With the aid of Math.pow (10,n);
2. With the help of. ToFixed (n) (JS 1.5 (ie5.5+,ns6+ above version supported).
test the output of pi=3.14159265:
accurate to n digits after the decimal point, with the help of Math.pow (10,n):
3.1
3.14
3.142
3.1416
accurate to n digits after the decimal point, with the help of ... ToFixed (n):
3.1
3.14
3.142
3.1416

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