JavaScript Learning Notes (ii)

This time the main record is the type conversion in JavaScript and three encoding functions.

One, type conversion

Type conversions in JavaScript, which belong to global objects.

parseint (string); Converts a string to an integer parsefloat (string); To convert a string to a floating-point type

Number turns into String type:

Num.tostring (); num.tostring (2); Display Num.tostring (8) in binary form; num.tostring (16);

Two or three encoding functions (ref. W3school)

Encoding functions become URIs, a more important use is to ensure that some special characters can be in different places (such as client, server side) can be normal parsing.

1. encodeURI ();

Reference: http://www.w3school.com.cn/jsref/jsref_encodeuri.asp

A string can be encoded as a URI (a Universal Resource identifier).

Use: encodeURI (uristring), where certain characters are replaced by hexadecimal escape sequences.

The method does not encode ASCII letters and numbers, nor does it encode these ASCII punctuation marks:-_. ! ~ * ' ()
Such as:

document.write (encodeURI ("Http://www.w3school.com.cn/My first/"));

Output:
http://www.w3school.com.cn/My%20first/

　2. encodeURIComponent ();

Reference: http://www.w3school.com.cn/jsref/jsref_encodeURIComponent.asp
The string is encoded as a URI component.
The difference from encodeURI:
Such as:
document.write (encodeURIComponent ("http://www.w3school.com.cn/p 1/"));
Output: (Space is%20)
http%3a%2f%2fwww.w3school.com.cn%2fp%201%2f

3. Escape ();

　　Reference: http://www.w3school.com.cn/jsref/jsref_escape.asp
Encoding a string allows the string to be read on all computers.
Such as:
document.write (Escape ("Visit w3school!");
Output:
Visit%20w3school%21

JavaScript Learning Notes (ii)