How can i validate credit/debit card by using jquery/javascript? I have tried to do by using Luhn algorithm. function checkLuhn(input) { var sum = 0; var numdigits = input.length; var parity = numdigits % 2; for(var i=0; i < numdigits; i++) { var digit = parseInt(input.charAt(i)) if(i % 2 == parity) digit *= 2; if(digit > 9) digit -= 9; sum += dig
我如何使用jquery / javascript验证信用卡/借记卡？ 我试图通过使用Luhn算法来完成。 function checkLuhn(input) { var sum = 0; var numdigits = input.length; var parity = numdigits % 2; for(var i=0; i < numdigits; i++) { var digit = parseInt(input.charAt(i)) if(i % 2 == parity) digit *= 2; if(digit > 9) digit -= 9; sum += digit; } return (sum % 10) ==
This question already has an answer here: How do you detect Credit card type based on number? 26 answers I believe you are probably looking for something like this: <script type="text/javascript"> function GetCardType(number) { // visa var re = new RegExp("^4"); if (number.match(re) != null) return "Visa"; // Mastercard // Updated for Mastercard 2017 BINs
这个问题在这里已经有了答案： 如何根据数字检测信用卡类型？ 26个答案 我相信你可能正在寻找像这样的东西： <script type="text/javascript"> function GetCardType(number) { // visa var re = new RegExp("^4"); if (number.match(re) != null) return "Visa"; // Mastercard // Updated for Mastercard 2017 BINs expansion if (/^(5[1-5][0-9]{14}|2(22[1-9][0-9]{12}|2[3-9
What is the difference between alert("abc".substr(0,2)); and alert("abc".substring(0,2)); They both seem to output “ab”. The difference is in the second argument. The second argument to substring is the index to stop at (but not include), but the second argument to substr is the maximum length to return. Links? https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/String
有什么区别 alert("abc".substr(0,2)); 和 alert("abc".substring(0,2)); 他们都似乎输出“ab”。 不同之处在于第二个参数。 substring的第二个参数是要停止的索引（但不包括），但substr的第二个参数是要返回的最大长度。 链接？ https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/String/substr https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/String/substring su
I have this array: [{name: 'email',value: 'a@b.com'}, {name: 'phone',value: '123-123-1234'}] I need to turn it into this: {email: 'a@b.com', phone: '123-123-1234'} How can I do this? I figure I can do a million iterators to get the job done, but I think maybe there's a cleaner way to do this. I'm using Underscore and jQuery if that helps. There are several ways to do that task.
我有这个数组： [{name: 'email',value: 'a@b.com'}, {name: 'phone',value: '123-123-1234'}] 我需要把它变成这样： {email: 'a@b.com', phone: '123-123-1234'} 我怎样才能做到这一点？ 我想我可以做一百万个迭代器来完成这项工作，但我认为也许有更简单的方法来完成这项工作。 如果有帮助，我使用Underscore和jQuery。 有几种方法可以完成这项任务。 一个是使用Array.prototype.map ： var arr = [{name: 'email',
I try to add a default value to an option. It will be like a kind of placeholder and I use this method to do it. In pure HTML it work, but if I try to use *ngFor of angular 2 attribute, it doesn't select anything. Here my code that I use in pure HTML: <select name="select-html" id="select-html"> <option value="0" selected disabled>Select Language</option> <
我尝试将一个默认值添加到一个选项。 它将像一种占位符，我使用这种方法来做到这一点。 在纯HTML中它可以工作，但是如果我尝试使用角度2属性的*ngFor ，它不会选择任何内容。 在这里我使用纯HTML格式的代码： <select name="select-html" id="select-html"> <option value="0" selected disabled>Select Language</option> <option value="1">HTML</option> <option value="
I'm wondering how to achieve the placeholder effect with the select tag, it would be really nice to have the default selected option something like "Please Chose an Option:". I have tried some variations and they are not working so far and I'm sure that it can be achieved cause i seen it somewhere (can't remember where). I have tried this: 1) <fieldset>
我想知道如何通过select标签实现placeholder效果，如果有默认选择选项，例如“请选择一个选项：”，这将非常好。 我尝试了一些变化，他们不工作到目前为止，我敢肯定，它可以实现，因为我看到它的某个地方（不记得在哪里）。 我试过这个： 1） <fieldset> <select data-placeholder="Please select a product" id="s1" class="global"> <option value="Some">Some</option
This question already has an answer here: How do I make a placeholder for a 'select' box? 19 answers edit: this code is only to force users to choose a valid option, instead of the one by default... validation for submit/change/etc should be added You should just disable the first option and setting it as selected by default: <select name="name"> <option disabled="disab
这个问题在这里已经有了答案： 如何为“选择”框创建占位符？ 19个答案 编辑：此代码只是强制用户选择一个有效的选项，而不是默认的一个...验证提交/更改/等应添加 您应该禁用第一个选项并将其设置为默认选中状态： <select name="name"> <option disabled="disabled" selected="selected">Select an option.</option> <option>A</option> <option>B</option> <optio
So, I'm trying to get the placeholder attribute to work in IE9 and below. However, I'm getting odd behavior (see screenshots below). I found this website and decided to use the JS code below: JS: // Checks browser support for the placeholder attribute jQuery(function() { jQuery.support.placeholder = false; test = document.createElement('input'); if('placeholder'
所以，我试图让占位符属性在IE9及更低版本中工作。 但是，我收到了奇怪的行为（请参阅下面的截图）。 我发现这个网站，并决定使用下面的JS代码： JS： // Checks browser support for the placeholder attribute jQuery(function() { jQuery.support.placeholder = false; test = document.createElement('input'); if('placeholder' in test) jQuery.support.placeholder = true; }); // Pla
Ok, so to overcome IE's lack of support for HTML5's Placeholder attribute, I wrote some JS that loops over inputs and sets the value of the input to be the placeholder attribute value for browsers that don't support it. Now this works fine, however on password fields, whatever the value is, appears as dots/bullets to obscure passwords. Now what measures and methods can I take to ge
好的，为了克服IE对HTML5的占位符属性的支持不足，我编写了一些JS来循环输入，并将输入的值设置为不支持它的浏览器的占位符属性值。 现在，这可以正常工作，但是在密码字段中，无论值是什么，都会显示为点/项目符号以隐藏密码。 现在我可以采取什么措施和方法来解决这个问题？ 要有一个占位符样式效果，但在输入[type =“password”]？ 在查看HTML5 Cross Browser Polyfills的“Web Forms：input placeholder”部分时，我看到
The Solution to the issue of placeholders not working in internet explorer is as follows using a combination of javascript and jquery. I must repeat that the Solution to the issue of placeholders not working in internet explorer is as follows using a combination of javascript and jquery. //DETERMINE BROWSER TYPE var browser=''; jQuery.each(jQuery.browser, function(i, val) {
使用JavaScript和jQuery的组合来解决不在Internet Explorer中工作的占位符问题的解决方案如下。 我必须重申，在Internet Explorer中不能工作的占位符问题的解决方案如下使用JavaScript和jQuery的组合。 //DETERMINE BROWSER TYPE var browser=''; jQuery.each(jQuery.browser, function(i, val) { if(i=='msie')browser=i; }); if(browser=='msie'){ var password = '<input type="te