JavaScricp, javascri

JavaScricp, javascri

JavaScript syntax

The basic data type is basically the same as that of C #. The omnipotent variable var can store other types of values and can be directly used.

Explicit conversion:

Parseint () -- convert to an integer

Parsefloat () -- convert to decimal

Operator: Same as C #

Mathematical operators: +-*/% + + --;

Relational OPERATOR: =! ==>=<=;

Logical OPERATOR: & | !;

Other operators: + =-= * =/= % =? :

Branch statement:

If... else

Loop statement:

For ()

Array:

New Array (); -- fixed type, Unfixed Length

Array attribute: a. length; number of array elements

 

JavaScript is a scripting language

Common Dialog Box:

• Alert () -- warning dialog box to pop up a warning dialog box
• Confirm () -- returns True or false with the OK or cancel buttons
• Prompt () -- a dialog box that can be entered is displayed.

 

 

Function:

Function Name (parameter ){}

Function () {}-- anonymous function

Window object:

• Window. open ("open URL" "open Location ")
• Window. opener -- open the previous page on this page
• Window. close () -- close the current page
• Window. navigate ("url") -- hyperlink Function
• Window. moveTo (x, y) -- move the browser to a certain position
• Window. resizeTo (x, y) -- set the width and height of the browser
• Window. scrollTo (x, y) -- anchor Function

Timer:

• Window. setTimeout (function () {}, interval of execution time) -- how long will it be executed? only once
• Window. setInterval (function () {}, interval execution time) -- The interval at which execution is performed and does not stop

Window. history:

• Window. history. back () -- return the page
• Window. history. forward () -- page forward
• Window. history. go (n) -- forward and backward. If n is positive, the system advances to n pages. If n is negative, the system returns to n pages.
• Window. location. href = "url" -- hyperlink, mainly
• Window. status -- objects in the toolbar at the bottom of the Operation page

Window.doc ument:

• Docunment. getElementById ("id"); locate by id. You can find one at most;
• Docunment. getElementsByName ("name"); find the array by name;
• Docunment. getElementsByTagName ("name"); find the Tag name and find the array;
• Docunment. getElementsByClassName ("name") is searched based on classname and an array is found;