how to use javascript debugger in firefox

return values, undefined variables, and case-insensitive errors. You can use this function to detect syntax errors in the code. [Javascript]Function handleErr (msg, url, l){Txt = "This page contains errors. \ N"Txt + = "error:" + msg + "\ n"Txt + = "URL:" + url + "\ n"Txt + = "row:" + l + "\ n"Txt + = "click" OK "to continue. \ N"Alert (txt)Return true}3. debug js Code3.1 create a breakpoint Click the left

;Remove ClassJq$ (EL). Removeclass (ClassName);JsRemoveclass, takes, Params:element and classnamefunction Removeclass (el, CLS) {var reg = new RegExp ("(\\s|^)" + CLS + "(\\s|$)");El.classname = El.className.replace (Reg, ""). Replace (/(^\s*) | ( \s*$)/g, "");}If you only need to support a more modern browser like Ie10+,chrome,firefox,opera and Safari, then you can start using HTML5 's classlist feature, which makes adding and removing classes easier

In a few simple steps, you can use javascript to retrieve the asterisks and passwords stored in your browser. 1. Open a browser2. Go to the login page where you saved your password3. Enter the following script in the address bar of the browser:Javascript :( function () {var s, F, j, f, I; s = ""; F = document. forms; for (j = 0; j 4. Press ENTER5. The password will be displayed on the pop-up page.A 3.6 pas

This article mainly introduces how to solve the problem of communication between the parent page and the iframe page through pseudo-Protocol. For more information, see the operations on the parent page and the iframe page. For example: The content in this iframe is written in js. As shown in the following code: var iframe = document.getElementById("iframe"), doc = iframe.contentWindow.document;doc.open();doc.write("---------something------");doc.close(); The above code is correct in most ca

This article mainly introduces how to solve the problem of communication between the parent page and the iframe page through pseudo-protocol. For more information, see the operations on the parent page and the iframe page. for example: The content in this iframe is written in js. As shown in the following code: var iframe = document.getElementById("iframe"), doc = iframe.contentWindow.document;doc.open();doc.write("---------something------");doc.close(); The above code is correct in most ca

('/'); } GetDomain ("http://www.aneventapart.com/2010/seattle/slides/"); "Http://www.aneventapart.com" getdomain ("https://addons.mozilla.org/en-US/firefox/bookmarks/"); "Https://addons.mozilla.org" Modify Numeric MembersJoin,split can easily modify the array members if we mix them together. But this function is also not difficult to imagine, its main function is to remove the given array of each member before the specified string. va

This article describes how to use javascript to obtain element styles. For more information, see getComputedStyle and currentStyle. 1. inline CSS styles for elements ( Hello), You can directly use element. style. color to directly obtain the css attribute value; 2. however, this method cannot be used for externally defined css styles, and IE and other standard

method One: Applicable browser: IE5 above the IE browser Using Technology: Conditional comments Where to use: in HTML code (note not in CSS) Comparison character: LTE: Is the shorthand for less than or equal to, meaning less than or equal to.LT: It is the shorthand for less than, which means less than.GTE: is the shorthand for greater than or equal to, which is greater than or equal to the meaning.GT: is the shorthand for greater than, which means gr

What is a ConsoleThe Console is a separate window for displaying JS and DOM object information. and inject 1 console objects into JS, using this object to output information to the console window.Second what browser support ConsoleMany people may know that the Console is supported in Chrome and FireFox (FireBug). Other browsers are not supported. For example, IE8 's own development tools support Console, but the function is more monotonous, display ob

, clientY minus left and top returned by the getBoundingClientRect method. In this way, a simple mouse painting function is completed, and there are also shortcomings, such as the inability to draw points... I personally think it is still relatively weak to use canvas for drawing, and complicated functions are not very easy to implement. However, you can try to add a method to save the image, for example, define Draw. prototype. save = function (){...

Http://sunxboy.javaeye.com/blog/191652 Use JavaScript to move up and down rows Keyword: Row MovementHTML code Description: Row movement, compatible with IE/Firefox Size: 2 kb