Getting Started with PHP (8) PHP interacts with JavaScript

JavaScript is a scripting language that can be embedded in HTML code that has a browser running, based on event and object driven.

JavaScript is powerful, and the main features of the Web page are the following:

1. Validating forms

2. Web effects

JavaScript is still a lot of content, here we simply introduce the following JavaScript syntax rules.

Data types for JavaScript

String type (single quote multi-quote) numeric (integer, floating-point) Boolean (True False) object

Null value (used to clear the contents of a variable a = null;) undefined (the variable has not been assigned a value)

The use of the keyword VAR for the declaration and assignment of JavaScript variables

var var_name = value;

It is recommended that you declare a variable before you use it to make it easier to troubleshoot errors.

In JavaScript, each statement ends with a semicolon.

JavaScript definition functions

function Func_name (parameter) {

return var;

}

Calling functions

Func_name (); /* Parentheses cannot be omitted */

How JavaScript is embedded in the script

1. Can be embedded directly into the HTML code

<script language= "javascript" >/*language attribute can be omitted by default is javascript*/

JavaScript statements;

</script>

<body> <script> alert ("I am ceo,you son of Bitch"); </script></body>

JavaScript functions usually trigger execution under the corresponding event.

<input type= "Submit" name= "Submit" value= "Check" onclick= "Check ();" >

2. Referencing JavaScript files

<script src= "JS file path" ></script>

You can do this by writing JavaScript code separately into a JavaScript file with JS as the suffix name

Referencing JavaScript files in this way requires attention:

Only JavaScript script code can be included in a JavaScript file and cannot contain <script></script> and HTML code

JavaScript code cannot be included in the <script></script> that references JavaScript scripts.

This article is from the "thick Product Thin Hair" blog, please make sure to keep this source http://joedlut.blog.51cto.com/6570198/1855505

Getting Started with PHP (8) PHP interacts with JavaScript