JS Processing rounding function toFixed (n) (preferably n digits after decimal point)

The function that is rounded in JS is toFixed (n), and N is the number of decimal digits to keep. N is 0~20, and when N exceeds 20, JS will go wrong.

If it is 0 o'clock before the decimal point and the previous one to be intercepted, it is not normally intercepted.
var h=0.07
The value of h.tofixed (1) is 0.0

In fact, to solve this problem, it is not necessary to rewrite JS in the number type of the Tofixed method.
A very cow colleague, think of a he said very stupid, but I feel very cow method.
The JS API says that at least one of the intercepted bits is not 0.
So, his stupid but very good way is: Use the tofixed method before adding 1, after use and then minus 1.

1     var num = 0.007;//The number  to be rounded 2    var fixnum = new (num+1). toFixed (2);//+ 1 before rounding   3     var fixednum = new Number (fixNum-1). toFixed (2);//minus 1 after rounding, then rounding   4     alert ( Fixednum);//The number that pops up is the correct rounding result.  

Method Two:

The following script overrides the tofixed () so that 0.056 can be converted to 0.1.

1 number.prototype.tofixed=function (len)2 {3 var add = 0;4 var s,temp;5 var S1 = this + "";6 var start = S1.indexof (".");7 if (s1.substr (start+len+1,1) >=5) add=1;8 var temp = Math.pow (10,len);9 s = Math.floor (This * temp) + add;Ten return s/temp; One}

Article from: http://blog.csdn.net/nuptsv_ice/article/details/10493659

JS Processing rounding function toFixed (n) (preferably n digits after decimal point)