JavaScript---Basic wrapper object

Summarize:

• The basic packing type is actually summed up, number and string type!!! Here are the properties and methods that I think are very common.

properties and methods for 1.Number

Property:

//static properties do not require a new    1. Min_value//Minimum Value    2. NaN//non-numeric    3. Negative_infinity//negative infinity, overflow return    4. Positive_infitity//infinity, overflow return    5. prototype//prototypes for adding new properties and Methods    6. Max_value//Maximum Valuesuch as: A1ert (Number.MAX_VALUE); alert (Number.NaN);

Method:

    varbox=1000.75284; Alert (typeofbox); Alert (typeofBox.tostring ())//Convert a value to a stringAlert (box.tolocalestring ())//localizationAlert (box.tofixed (2))//the decimal point retains two bits and converts the stringAlert (box.toexponential ())//in exponential form, and converted into a stringAlert (Box.toprecision (3))//in exponential form, the argument is to retain the specified number of digits after the decimal point and convert to a string of 1.00E+3

Properties and methods for 2.String

Property:

    // Normal Properties    var box='string is    string';    alert (box.length);                 // string length    Alert (box.constructor)            // returns the function that created the string object    alert (box.prototype)            //  Expanding a string definition by adding properties and methods

Method:

    // Character Method    Alert (Box.charat (1));            // returns the specified subscript value, indexed starting from 0        T    alert (box.charcodeat (1));        // return means to set the mark worth Ascall code         

    //string Manipulation MethodsAlert (Box.concat (' is','string','!!'));//concatenate string arguments into a string that invokes a methodAlert (Box.slice (2,5));//returns a string from 2 to 5 RinAlert (box.substring (2,5));//Ibid .Alert (BOX.SUBSTR (2,2));//Select 2 Ri from the second start

Note: It is not the same to distinguish between the character method and the string method.

    //String Position methodAlert (Box.indexof ('R'))//returns the position of the first occurrence of the search from the initial position 2 cannot find the return-1Alert (Box.lastindexof ('R'))//returns the position of the first occurrence of the search r from the end positionAlert (Box.indexof ('R',5))//search starting from fifth positionAlert (Box.lastindexof ('R',5))//search forward from fifth position 2

    Alert (Box.tolowercase ())                // convert to lowercase        localization tolocalelowercase ()    alert (Box.touppercase ())                // convert to uppercase        Ibid .

    //string pattern matching methodAlert (Box.match ('R'))//returns the found string, unable to find the returned nullAlert (Box.search ('R'))//return position, cannot find return-1Alert (Box.replace ('R','Q'))//Replacealert (box); Alert (Box.split (' '))//separating the array with spaces as a standardAlert (Box)

Note: The string matching method appears after the alert (box) is in order to verify that the original object array has been altered, and that the validation has not changed.

JavaScript---Basic wrapper object