Brief Description: 1. Before the advent of JavaScript, form data validation is through server-side verification, and because the dial-up time of the internet is very slow, JavaScript turned out to be a perfect solution to this problem, perfect support for client form validation2. After years of development, JavaScript from a simple input validation into a powerful object-oriented, interpreted, event-driven programming language, currently used mainly to verify data sent to the server, increase Web interaction, enhance user experience, etc.
Historical Review: 1. In 1995, Netscape and Sun developed the JavaScript scripting language, and Microsoft was jealous of the development of a JavaScript clone, called JScript, and installed in its own IE browser2.1997 Proposed standardized specifications, Microsoft see potential change JScript fully complies with the standard specification, Netscape because later than a year after the full support of the specification led to late cottage JScript defeated JavaScript, Netscape overall rout3.1999 Firefox was born, and in JavaScript is Microsoft's IE incomparable, this later time began to nibble on the market of IE, called the world's second largest browser4. Google Chrome with its concise page, the speed of browsing, the current market share of the world third, Safari support cross-platform, the current market share of the World IV, opera as a survivor of the browser war, the current market share of the world's fifth
Core components:
| Contains part |
Related instructions |
| Core syntax |
syntax, type, statement, keyword, reserved word, operator, object, etc. |
| Document Object Model |
DOM, application programming interface for XML but extended for HTML |
| Browser Object Model |
BOM, access and manipulation of browser window's browser object model, which can be displayed by the BOM control browser outside the page |
0001.JavaScript Simple Overview
