1. A development method for a web development system, comprising: in a running state of the web development system, performing the following steps: generating or modifying script code used to perform a predetermined function; parsing, by a script parser, the generated script code or the modified script code to correspondingly generate an object type which performs a new function, or to modify the object type which performs an existing function; and generating a new function object or modifying the existing function object, by an object manager, according to the generated object type which performs the new function or the modified object type which performs the existing function, and organizing invoking relationships between the new function object and other objects, or invoking relationships between the modified function object and other objects, so as to generate or modify the predetermined function when the web development system is operating.