oralert

There are two ways to use regular expressions in JavaScript. The first is to build a RegExp object, and the second is to use "//" to define the Perl style. For example: The code is as follows Copy Code var str = ' http://www.111cn.net/';var reg = new RegExp (' http ', ' I ');Alert (Reg.test (str));OrAlert (/http/.test (str)); The above example is to use two ways to determine if the string str contains HTTP, note

Administrator) permission orAlert userSystem permissions Alter user Lida identified by Lida; 3. delete a user Generally, a user is deleted as a DBA. If another user is used to delete a user, the user must have the permission to drop the user. The command to delete the user is: Drop User Username [cascade] Note: If you have already created a table, you need to include the [cascade] parameter when deleting the table. when a user is deleted, t

define the CSS class style Remove Style $ ("P"). Removeclass ("Lyo") To remove multiple class styles, you can separate them with a space, remove all, and not pass arguments Toggle Style $ ("P"). Toggleclass ("Lyo") 1, as a switch class style name 2, whether to open the style (true/false/expression returns bool value), if the parameter is not set, the system will be based on whether there is an automatic toggle display hidden Judging

(); // Constructor// Note: the Array. isArray method is not supported in IE6/7/8.Alert (Array. isArray (array0 ));// Considering compatibility, you can useAlert (array1 instanceof Array );// OrAlert (Object. prototype. toString. call (array1) === '[object Array]'); 2 arrays and strings Very simple: converts an array to a string, uses join, converts a string to an array, and uses split.Copy codeThe Code is as follows: // join-converts an array to a st

string type internally, because the property name in the JavaScript Object must be a string. Ii. Operations 1. Determine the array type The Code is as follows: Var array0 = []; // literalVar array1 = new Array (); // Constructor// Note: the Array. isArray method is not supported in IE6/7/8.Alert (Array. isArray (array0 ));// Considering compatibility, you can useAlert (array1 instanceof Array );// OrAlert (Object. prototype. toString. call (array1)

Recent projects have encountered this problem, by the way record!Find the information on the Internet to understand understanding, give my understanding as follows:Question 1:(function () {}) (): This function () {} represents an anonymous one, and () wraps the functions () {}, () representing the highest priority execution, which takes precedence over the function () {}. The last () means that the function () { } is called immediately after executing function () {}. Like what:If function () {}

/DOM node/EXTAnd returns its DOM object.For example, alert (EXT. Getdom ("A"). innerhtml); orAlert (EXT. Getdom (document. getelementbyid ("A"). innerhtml );The innerhtml content of the element with ID a is returned. 15,EXT. Getdoc ()/EXT. Getbody ():EXT. ElementReturn the Document Object and body object of the page respectively. The return value isEXTInstead of DOM object. 16,EXT. Getcmp(String ID ):EXT. ComponentThe component type of the input HTML

The method of overriding the Window object is not a novelty, for example, we may need to change the behavior of the default alert, how to rewrite it safely?Side dishes see a well-known it web site is such a way to:Window.alert = function () {};Oralert = function () {};In fact, the wording is somewhat defective. This is equivalent to adding an alert property on the Window object that has a higher priority than the system's built-in alert, so it can be