I have added a simple .js file to my page that has some pretty mundane common-task sort of functions added to the Object and Array prototypes. Through trial and error, I've figured out that adding any function to Object.prototype , no matter it's name or what it does causes Javascript errors in jQuery: The culprit? Object.prototype.foo = function() { /*do nothing and break jQuery
我在页面中添加了一个简单的.js文件，其中添加了一些非常普通的任务类型的功能，添加到Object和Array原型中。 通过试验和错误，我发现在Object.prototype中添加了任何函数，不管它的名字是什么，或者它在jQuery中导致Javascript错误： 罪魁祸首？ Object.prototype.foo = function() { /*do nothing and break jQuery*/ }; 我在attr：function {}声明中得到了jquery-1.3.2.js第1056行的错误： /*Object doesn't suppor
I need to get execution time in milliseconds. I originally asked this question back in 2008. The accepted answer then was to use new Date().getTime() However, we can all agree now that using the standard performance.now() API is more appropriate. I am therefore changing the accepted answer to this one. You can use console.time : (non-standard) console.time('someFunction'); someFunction();
我需要以毫秒为单位获得执行时间。 我最初在2008年问过这个问题。然后接受的答案是使用新的Date（）。getTime（）但是，我们现在都可以同意使用标准的performance.now（）API更合适。 因此，我正在改变对这一问题的接受答案。 你可以使用console.time :(非标准） console.time('someFunction'); someFunction(); // run whatever needs to be timed in between the statements console.timeEnd('someFunction'); 注意
How can I loop through all the entries in an array using JavaScript? I thought it was something like this: forEach(instance in theArray) Where theArray is my array, but this seems to be incorrect. TL;DR Don't use for-in unless you use it with safeguards or are at least aware of why it might bite you. Your best bets are usually a for-of loop (ES2015+ only), Array#forEach ( spec |
如何使用JavaScript循环访问数组中的所有条目？ 我认为这是这样的： forEach(instance in theArray) 凡theArray是我的阵列，但是这似乎是不正确的。 TL; DR 除非您使用保护措施或至少知道它为什么会咬你for-in否则不要使用原装。 你最好的投注通常是 一个for-of循环（仅限ES2015 +）， Array#forEach （ spec | MDN ）（或其亲属some等）（仅限ES5 +）， 一个简单的老式for循环， 或者for-in有保障。 但还有
What is the reason browsers do not correctly recognize: <script src="foobar.js" /> <!-- self-closing script tag --> Only this is recognized: <script src="foobar.js"></script> Does this break the concept of XHTML support? Note: This statement is correct at least for all IE (6-8 beta 2). XHTML 1 specification says: С.3. Element Minimization and Empty Element Conte
浏览器无法正确识别的原因是什么： <script src="foobar.js" /> <!-- self-closing script tag --> 只有这一点被认可： <script src="foobar.js"></script> 这是否违反了XHTML支持的概念？ 注意：至少对于所有IE（6-8测试版2）这个说法是正确的。 XHTML 1规范说： С.3。 元素最小化和空元素内容 给定一个元素的内容模型不是EMPTY的空实例（例如，一个空的标题或段落）不要使用最小化的形式
As detailed elsewhere, and otherwise apparently well-known, Internet Explorer (definitely version 7, and in some instances, version 8) do not implement key functions, in particular on Array (such as forEach , indexOf , etc). There are a number of workarounds here and there, but I'd like to fold a proper, canonical set of implementations into our site rather than copy and paste or hack away
如其他地方详细描述的那样，另外显然众所周知的是，Internet Explorer（绝对版本7，以及某些情况下，版本8）不实现关键函数，特别是在Array （例如forEach ， indexOf等）。 在这里和那里有很多解决方法，但是我想将适当的，规范的实现集合放到我们的站点中，而不是复制，粘贴或者破解我们自己的实现。 我找到了js-methods，看起来很有前途，但是我以为我会在这里发布看看另一个库是否更受推荐。 一些其他标准： 对于浏览
如何将JavaScript日期对象格式化为10-Aug-2010打印？ function formatDate(date) { var monthNames = [ "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" ]; var day = date.getDate(); var monthIndex = date.getMonth(); var year = date.getFullYear(); return day + ' ' + monthNames[monthIndex]
如何将JavaScript日期对象格式化为10-Aug-2010打印？ function formatDate(date) { var monthNames = [ "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" ]; var day = date.getDate(); var monthIndex = date.getMonth(); var year = date.getFullYear(); return day + ' ' + monthNames[monthIndex]
I'd like to tell the difference between valid and invalid date objects in JS, but couldn't figure out how: var d = new Date("foo"); console.log(d.toString()); // shows 'Invalid Date' console.log(typeof d); // shows 'object' console.log(d instanceof Date); // shows 'true' Any ideas for writing an isValidDate function? Ash recommended Date.parse for parsing date strings, which gives an
我想告诉JS中有效和无效日期对象之间的区别，但不知道如何： var d = new Date("foo"); console.log(d.toString()); // shows 'Invalid Date' console.log(typeof d); // shows 'object' console.log(d instanceof Date); // shows 'true' 任何写作isValidDate函数的想法？ Ash推荐使用Date.parse来解析日期字符串，它提供了一种权威的方法来检查日期字符串是否有效。 如果可能的话，我更喜欢的是让我的API接受一个Date实
I noticed that JavaScript's new Date() function is very smart in accepting dates in several formats. Xmas95 = new Date("25 Dec, 1995 23:15:00") Xmas95 = new Date("2009 06 12,12:52:39") Xmas95 = new Date("20 09 2006,12:52:39") I could not find documentation anywhere showing all the valid string formats while calling new Date() function. This is for converting a string to a date. If we loo
我注意到JavaScript的new Date()函数在接受多种格式的日期方面非常聪明。 Xmas95 = new Date("25 Dec, 1995 23:15:00") Xmas95 = new Date("2009 06 12,12:52:39") Xmas95 = new Date("20 09 2006,12:52:39") 在调用new Date()函数时，我无法在任何地方找到显示所有有效字符串格式的文档。 这是将字符串转换为日期。 如果我们看一下另一面，即将日期对象转换为字符串，直到现在我的印象是JavaScript没有内置API来将日期对象
Can someone suggest a way to compare the values of two dates greater than, less than, and not in the past using JavaScript? The values will be coming from text boxes... The Date object will do what you want - construct one for each date, then compare them using the > , < , <= or >= . The == , != , === , and !== operators require you to use date.getTime() as in var d1 = new Date(
有人可以提出一种方法来比较两个日期的值大于，小于，而不是过去使用JavaScript？ 这些值将来自文本框... Date对象会做你想做的 - 为每个日期构造一个，然后使用> ， < ， <=或>=来比较它们。 == ， != ， ===和!==运算符要求您使用date.getTime() var d1 = new Date(); var d2 = new Date(d1); var same = d1.getTime() === d2.getTime(); var notSame = d1.getTime() !== d2.getTime(); 要明确直接检查与数
I got one weird issue with Date object initialization. And wondering if someone can explain why.. var exp1 = new Date('2014-10-17'); var exp2 = new Date(2014,9,17); var exp3 = new Date('17 Oct 2014'); console.log(exp1); console.log(exp2); console.log(exp3); Results: Thu Oct 16 2014 18:00:00 GMT-0600 (MDT) // 16th? Fri Oct 17 2014 00:00:00 GMT-0700 (MST) // Why GMT -7 Fri Oct 17 2014 00:00
Date对象初始化有一个奇怪的问题。 并想知道如果有人可以解释为什么.. var exp1 = new Date('2014-10-17'); var exp2 = new Date(2014,9,17); var exp3 = new Date('17 Oct 2014'); console.log(exp1); console.log(exp2); console.log(exp3); 结果： Thu Oct 16 2014 18:00:00 GMT-0600 (MDT) // 16th? Fri Oct 17 2014 00:00:00 GMT-0700 (MST) // Why GMT -7 Fri Oct 17 2014 00:00:00 GMT-0600 (MDT) // The only one