1、()
This method is used to take out the decimal part of a decimal and return the integer part. Let's see an example:
(1.234); //1
(-2.34141); //-2
(3.9); //3
//For non-numeric values, the number will be used internally to convert it into a numeric value("12.87656"); //12
//For null values and values that cannot be intercepted, return NaN("a"); //NaN
(); //NaN
(NaN); //NaN
2、()
This method is used to determine whether a number is a positive, negative, or zero. There are five return values. See the following example:
(23.235); //1
(25); //1
(0); //0
(0.0); //0
(-0.0); //-0
(-0); //-0
(-2); //-1
(-2.983958); //-1
('a'); //NaN
(); //NaN
(NaN); //NaN
When the parameter is a positive number, return 1;
When the parameter is 0, return 0;
When the parameter is -0, return -0;
When the parameter is negative, return -1;
When the parameter is another value, NaN is returned.
3、()
This method is used to calculate the cubic root of a number, equivalent to the (n,1/3) method.
(8); //2
(-64); //-4
//For non-numeric values, the method also uses the Number method to convert it into a numeric value first, and then calculate it("125"); //5
("a"); //NaN
4、()
This method is used to calculate the square root of the sum of squares of all parameters.
(3,4); //5
(1,2,3); //3.741657386773941
(-5); //5
(); //0
(NaN); //NaN
("a"); //NaN
(3,'4'); //5
(3,'a'); //NaN
The above methods can greatly simplify the code and are very convenient.
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