JQuery introduces the conversion and difference between DOM objects and jQuery objects.

JQuery introduces the conversion and difference between DOM objects and jQuery objects.

JQuery Hello World Program

<Script type = "text/javascript" src = "xxx // jquery-x.y.z.js"> introduce jQuery. there are two versions, the jquery-x.y.z.min.js is a simplified compressed version, without min is the development version, the comments and indentation in the Code are retained. note that "/" in the path must be escaped, that is, "//". the $ () symbol converts a DOM object to a jQuery object. the Hello World Program is as follows: