I am storing time in a MySQL database as a Unix timestamp and that gets sent to some JavaScript code. How would I get just the time out of it? For example, in HH/MM/SS format. // Create a new JavaScript Date object based on the timestamp // multiplied by 1000 so that the argument is in milliseconds, not seconds. var date = new Date(unix_timestamp*1000); // Hours part from the timestamp var ho
我将时间作为Unix时间戳存储在MySQL数据库中,并发送给一些JavaScript代码。 我怎样才能得到它的时间? 例如,以HH / MM / SS格式。 // Create a new JavaScript Date object based on the timestamp // multiplied by 1000 so that the argument is in milliseconds, not seconds. var date = new Date(unix_timestamp*1000); // Hours part from the timestamp var hours = date.getHours(); // Minutes part from the time
I am trying to loop through an array. I have the following code: var substr = currnt_image_list.split(','); //This will split up 21,32,234,223, Am trying to get all the data out of the array. Can some one lead me in the right path please? (Update: My other answer here lays out the non-jQuery options much more thoroughly. The third option below, jQuery.each , isn't in it though.) Thre
我试图循环访问一个数组。 我有以下代码: var substr = currnt_image_list.split(','); //This will split up 21,32,234,223, 我试图从数组中获取所有数据。 有人能带我走上正确的道路吗? (更新:我的其他答案更详细地列出了非jQuery选项,下面的第三个选项jQuery.each并不在其中)。 三种选择: 通用循环: var i; for (i = 0; i < substr.length; ++i) { // do something with `substr[i]` } 优点 :直
Which browsers other than Firefox support Array.forEach()? Mozilla say it's an extension to the standard and I realise it's trivial to add to the array prototype, I'm just wondering what other browsers support it? The JavaScript article of Wikipedia lists the JS versions by browser. forEach is part of JavaScript 1.6. So it is supported indeed by most browsers, except Opera 9.02 (
除Firefox之外的哪些浏览器支持Array.forEach()? Mozilla说这是对标准的扩展,我意识到添加到数组原型是微不足道的,我只是想知道其他浏览器支持它吗? 维基百科的JavaScript文章通过浏览器列出了JS版本。 forEach是JavaScript 1.6的一部分。 所以它被大多数浏览器支持,除了Opera 9.02(我刚测试过)。 Opera 9.5(我刚刚安装!)支持它,以及用于Array的indexOf。 令人惊讶的是,这不是官方的。 Opera 9.5中的页面
I am making a Javascript game with the canvas tag, and I am using an enhanced for loop to update the player positions. In brief: var actors = new Array(); var player = new Actor(0, 0, img); actors[0] = player; function update_positions() { //position 1 for(var a in actors) { //position2 a.xpos += a.xvel; a.ypos += a.yvel; } } Just outside of the for loop
我正在用画布标签制作一款Javascript游戏,并且我正在使用增强版for循环来更新玩家位置。 简单来说: var actors = new Array(); var player = new Actor(0, 0, img); actors[0] = player; function update_positions() { //position 1 for(var a in actors) { //position2 a.xpos += a.xvel; a.ypos += a.yvel; } } 就在位置1的for循环之外,我可以访问actors [0] .xvel的正确值。
I learned from books that you should write for loop like this: for(var i=0, len=arr.length; i < len; i++){ // blah blah } so the arr.length will not be calculated each time. Others say that the compiler will do some optimization to this, so you can just write: for(var i=0; i < arr.length; i++){ // blah blah } I just want to know which is the best way in practice? After perf
我从书本中学到,你应该像这样写循环: for(var i=0, len=arr.length; i < len; i++){ // blah blah } 所以arr.length将不会每次计算。 其他人说编译器会对此做一些优化,所以你可以写: for(var i=0; i < arr.length; i++){ // blah blah } 我只想知道哪个是实践中最好的方法? 用大多数现代浏览器执行此测试后... http://jsben.ch/#/y3SpC 目前 ,循环的最快形式(在我看来,语法最明显)。 一个
I was looking for an easy way to monitor an object or variable for changes, and I found Object.watch() , that's supported in Mozilla browsers, but not IE. So I started searching around to see if anyone had written some sort of equivalent. About the only thing I've found has been a jQuery plugin, but I'm not sure if that's the best way to go. I certainly use jQuery in most of m
我正在寻找一种简单的方法来监视对象或变量的变化,并且我发现了Object.watch() ,它在Mozilla浏览器中受支持,但不支持IE。 于是我开始四处搜寻,看看有没有人写过某种类似的东西。 关于我发现的唯一一件事是一个jQuery插件,但我不确定这是否是最好的方法。 我在大多数项目中肯定使用jQuery,所以我不担心jQuery方面的问题...... 无论如何,这个问题:有人可以给我看一个这个jQuery插件的实例吗? 我在解决问题方面遇到
This question already has an answer here: Cross browser JavaScript (not jQuery…) scroll to top animation 18 answers HTML: <button onclick="scrollToTop(1000);"></button> 1# JavaScript (linear): function scrollToTop(scrollDuration) { var scrollStep = -window.scrollY / (scrollDuration / 15), scrollInterval = setInterval(function(){ if ( window.scrollY != 0 ) {
这个问题在这里已经有了答案: 跨浏览器JavaScript(不是jQuery ...)滚动到顶部动画18个答案 HTML: <button onclick="scrollToTop(1000);"></button> 1#JavaScript(线性): function scrollToTop(scrollDuration) { var scrollStep = -window.scrollY / (scrollDuration / 15), scrollInterval = setInterval(function(){ if ( window.scrollY != 0 ) { window.scrollBy
I have to use $('html, body').animate() to make the snippet fully cross-browser compatible, but this is inconvenient when chaining animations as they will sometimes act on both <html> and <body> . IE8 depends on having 'html' while Chrome or Safari depend on having 'body', so therefore i must include both. Why the discrepancy? I think it's because the
我必须使用$('html, body').animate()使片段完全跨浏览器兼容,但这在链接动画时不方便,因为它们有时会同时作用于<html>和<body> 。 IE8依赖于'html',而Chrome或Safari依赖于'body',因此我必须包含这两者。 为何差异? 我认为这是因为滚动条(我假设你正在制作动画)是在不同位置的浏览器中构建的。 我以前遇到过这个问题,不得不使用与您合并的相同方法。 有点烦人,但当你希望
I have a big table with vertical scroll bar. I would like to scroll to a specific line in this table using jQuery/Javascript. Are there built-in methods to do this? Here is a little example to play with. div { width: 100px; height: 70px; border: 1px solid blue; overflow: auto; }<div> <table id="my_table"> <tr id='row_1'><td>1</td
我有一个垂直滚动条的大桌子。 我想使用jQuery / Javascript滚动到此表中的特定行。 有内置的方法来做到这一点? 这是一个小例子。 div { width: 100px; height: 70px; border: 1px solid blue; overflow: auto; }<div> <table id="my_table"> <tr id='row_1'><td>1</td></tr> <tr id='row_2'><td>2</td></tr>
I have to disable inputs at first and then on click of a link to enable them. This is what I have tried so far, but it doesn't work: HTML: <input type="text" disabled="disabled" class="inputDisabled" value=""> jQuery: $("#edit").click(function(event){ event.preventDefault(); $('.inputDisabled').removeAttr("disabled") }); This shows me true and then false but nothing change
我必须先禁用输入,然后点击链接启用它们。 这是我到目前为止所尝试的,但它不起作用: HTML: <input type="text" disabled="disabled" class="inputDisabled" value=""> jQuery的: $("#edit").click(function(event){ event.preventDefault(); $('.inputDisabled').removeAttr("disabled") }); 这表明我是true ,然后是false但输入没有任何变化: $("#edit").click(function(event){ alert(''); ev