Summary of Number methods in javascript

1. Constructor

　 Number(value)

　 new Number(value)

2. Number attribute

　 1. Number.MAX_VALUE Return the largest number that can be represented.

　2. Number.MIN_VALUE　The smallest number that can be represented.

　3. Number.NAN　　Non-numeric value.

　4. Number.NEGATIVE_INFINITY　 Negative infinity, returned when overflows.

　5. Number.POSITIVE_INFINITY　Positive infinity, returned when overflows.

3. Number method

　1. toString()　 Use the specified base to convert a number into a string.

　2. toLocaleString() Convert a number to a string in local number format.

　3. toFixed()　Convert a number to a string containing the specified number of decimal places.

　4. toExponential() Convert a number to a string, using the specified number of valid digits.

　5. valueOf()　 Return the original value of a Number object.

　6. toExponential() Format a number using exponential notation

document.write(Number.MIN_VALUE + "<br/>");  //5e-324
document.write(Number.MAX_VALUE + "<br/>");  //1.7976931348623157e+308
document.write(Number.NaN + "<br/>");   //NaN
document.write(Number.NEGATIVE_INFINITY + "<br/>"); //-Infinity
document.write(Number.POSITIVE_INFINITY + "<br/>"); //Infinity
 
var num = Number(5.123);      //5.123
document.write(num.toString() + "<br/>");  //5.123
document.write(num.toFixed(2) + "<br/>");  //5.123
document.write(num.toPrecision(2) + "<br/>"); //5.123
document.write(num.valueOf() + "<br/>");  //5.123
document.write(num.toExponential(1));   //5.1e+0