firebug

问题 I viewed the html source code, there is no <tbody> , but when viewed via firebug in the HTML tab, <tbody> appears. Any idea why? 回答1: To summarize the excellent explanations given in the answers and comments by bobince, Kieron, Alohci and others: Firebug just displays the DOM of the parsed page. Due to complicated HTML parsing rules, the DOM will "differ" (in some sense) from the source HTML. In this case the TBODY element in the DOM is added by the HTML parser. Note that this weird parsing

问题 Firebug for Firefox has a nice feature, called \"Break on property change\", where I can mark any property of any object, and it will stop JavaScript execution right before the change. I\'m trying to achieve the same in Google Chrome, and I can\'t find the function in Chrome debugger. How do I do this in Google Chrome? 回答1: If you don't mind messing around with the source, you could redefine the property with an accessor. // original object var obj = { someProp: 10 }; // save in another

问题 I am using this little script to find out whether Firebug is open: if (window.console && window.console.firebug) { //is open }; And it works well. Now I was searching for half an hour to find a way to detect whether Google Chrome\'s built-in web developer console is open, but I couldn\'t find any hint. This: if (window.console && window.console.chrome) { //is open }; doesn\'t work. EDIT: So it seems that it is not possible to detect whether the Chrome console is open. But there is a \"hack\"

问题 What is the use of console.log ? Please explain how to use it in JavaScript, with a code example. 回答1: It's not a jQuery feature but a feature for debugging purposes. You can for instance log something to the console when something happens. For instance: $('#someButton').click(function() { console.log('#someButton was clicked'); // do something }); You'd then see #someButton was clicked in Firebug’s “Console” tab (or another tool’s console — e.g. Chrome’s Web Inspector) when you would click

问题 I\'m trying to load a local JSON file but it won\'t work. Here is my JavaScript code (using jQuery: var json = $.getJSON(\"test.json\"); var data = eval(\"(\" +json.responseText + \")\"); document.write(data[\"a\"]); The test.json file: {\"a\" : \"b\", \"c\" : \"d\"} Nothing is displayed and Firebug tells me that data is undefined. In Firebug I can see json.responseText and it is good and valid, but it\'s strange when I copy the line: var data = eval(\"(\" +json.responseText + \")\"); in

问题 This is meant to provide a canonical Q&A to all that similar (but much too specific questions to be a close target candidate) popping up once or twice a week. I\'m developing an application that needs to parse a website with tables in it. As deriving XPath expression for scraping web pages is boring and error-prone work, I\'d like to use the XPath extractor feature of Firebug (or similar tools in other browsers) for this. Example input looks like this: <!-- snip --> <table id=\"example\"> <tr

问题 I need to debug a web application that uses jQuery to do some fairly complex and messy DOM manipulation. At one point, some of the events that were bound to particular elements, are not fired and simply stop working. If I had a capability to edit the application source, I would drill down and add a bunch of Firebug console.log() statements and comment/uncomment pieces of code to try to pinpoint the problem. But let\'s assume I cannot edit the application code and need to work entirely in

问题 What is the use of console.log ? Please explain how to use it in JavaScript, with a code example. 回答1: It's not a jQuery feature but a feature for debugging purposes. You can for instance log something to the console when something happens. For instance: $('#someButton').click(function() { console.log('#someButton was clicked'); // do something }); You'd then see #someButton was clicked in Firebug’s “Console” tab (or another tool’s console — e.g. Chrome’s Web Inspector) when you would click

问题 I\'m including some forms inside a HTML table to add new rows and update current rows. The problem that I\'m getting is that when I inspect the forms in my dev tools, I see that the form elements are closed immediately after opening (inputs, etc are not included within the form). As such, submitting a form fails to include the fields. The table row and inputs are as follows: <tr> <form method=\"post\" action=\"\"> <td> <input type=\"text\" name=\"job_num\"> </td> <td> <input type=\"text\"