This question already has an answer here: Check if object is array? 38 answers You can use the isArray function from jQuery: if (jQuery.isArray(specs)) { $overview.html('<div class="bullet_spec"></div>'); jQuery.each(specs, function () { $overview.children('div').append('<ul class="specs"><li class="label">' + this.k + ' : ' + this.v + '</li></u
这个问题在这里已经有了答案: 检查对象是否是数组? 38个答案 你可以使用jQuery中的isArray函数: if (jQuery.isArray(specs)) { $overview.html('<div class="bullet_spec"></div>'); jQuery.each(specs, function () { $overview.children('div').append('<ul class="specs"><li class="label">' + this.k + ' : ' + this.v + '</li></ul>'); }); } 然而,看起来
This question already has an answer here: Check if object is array? 38 answers Array.isArray(arr) will return true . Array.isArray(obj) will return false .
这个问题在这里已经有了答案: 检查对象是否是数组? 38个答案 Array.isArray(arr)将返回true 。 Array.isArray(obj)将返回false 。
This question already has an answer here: Check if object is array? 38 answers EDIT: As @Jaromanda X pointed out in the other answer you can use concat: var result = [].concat(aFunction()); kudos! I don't think there is a way to do this without an if, so just check if the output is a String and, in case, add it to an empty array. var result = myFn(); if (typeof result === 'string'
这个问题在这里已经有了答案: 检查对象是否是数组? 38个答案 编辑: 正如@Jaromanda X在其他答案中指出的,您可以使用concat: var result = [].concat(aFunction()); 荣誉! 如果没有if,我认为没有办法做到这一点,所以只需检查输出是否为String,并在需要时将其添加到空数组中。 var result = myFn(); if (typeof result === 'string' || result instanceof String) { result = new Array(result); } 使用数
This question already has an answer here: Check if object is array? 38 answers Checking typeof key === 'array' is incorrect since for arrays typeof will return "object" . You can try to use instanceof instead: if (key instanceof Array) { // do something } else { // do another stuff } But this will fail if your JSON was created in another frame. Another option is
这个问题在这里已经有了答案: 检查对象是否是数组? 38个答案 检查typeof key === 'array'不正确,因为对于数组, typeof将返回"object" 。 你可以尝试使用instanceof来代替: if (key instanceof Array) { // do something } else { // do another stuff } 但是如果你的JSON是在另一个框架中创建的,那么这将失败。 另一种选择是检查toString() Object.prototype.toString.call(key).index
As the title states, using React.cloneElement inside React.Children.map is causing element keys to change. Here is a sandbox demonstrating this. React.Children.map(children, (child) => { let clonedEl = React.cloneElement( child ); console.log(clonedEl); return clonedEl; }); The result of that block of code has elements with .$ added to the front of every key. This is really co
正如标题状态,使用React.cloneElement内React.Children.map导致元素键来改变。 这是一个演示这个的沙箱。 React.Children.map(children, (child) => { let clonedEl = React.cloneElement( child ); console.log(clonedEl); return clonedEl; }); 该代码块的结果具有添加到每个键前面的.$元素。 这真是令人困惑,有两个原因。 1:文档说cloneElement将保留键和参考。 使用元素克隆并返回一个新的React
I've created a button with attribute named 'loaded' and initial value of 'no'. Upon clicking the button I'm running some ajax and at the very end of it I'm trying to set the 'loaded' attribute to 'yes' so that the ajax is not ran again if the user clicks on the button more than once. I have something like this: http://jsfiddle.net/PDW35/2/ Clicking
我创建了一个名为'loaded'且初始值为'no'的按钮。 点击按钮我正在运行一些Ajax,并在它的最后,我试图将“加载”属性设置为“是”,以便如果用户多次单击按钮,ajax不会再次运行。 我有这样的东西:http://jsfiddle.net/PDW35/2/ 点击按钮不会改变加载到“是”。 但是,如果您在.attr调用之后立即执行警报,如下所示: alert($(this).attr('loaded')); 警告框确实包含'yes',这没有帮助,因为一旦用户
RequireJS seems to do something internally that caches required javascript files. If I make a change to one of the required files, I have to rename the file in order for the changes to be applied. The common trick of appending a version number as a querystring param to the end of the filename does not work with requirejs <script src="jsfile.js?v2"></script> What I am lo
RequireJS似乎在内部做了一些需要JavaScript文件的缓存。 如果我对其中一个必需的文件进行了更改,则必须重命名该文件才能应用更改。 将版本号作为查询字符串参数附加到文件名末尾的常见技巧不适用于requirejs <script src="jsfile.js?v2"></script> 我正在寻找的是防止这种内部缓存RequireJS必需脚本的方法,而不必在每次更新时重命名脚本文件。 跨平台解决方案: 我现在在开发过程中使用urlArg
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
我试图加载一个本地的JSON文件,但它不会工作。 这是我的JavaScript代码(使用jQuery: var json = $.getJSON("test.json"); var data = eval("(" +json.responseText + ")"); document.write(data["a"]); test.json文件: {"a" : "b", "c" : "d"} 什么都不显示,Firebug告诉我数据未定义。 在Firebug中,我可以看到json.responseText ,它是好的和有效的,但是当我复制该行时,它很奇怪: var data = eval("(" +json.res
So jQuery 1.6 has the new function prop() . $(selector).click(function(){ //instead of: this.getAttribute('style'); //do i use: $(this).prop('style'); //or: $(this).attr('style'); }) or in this case do they do the same thing? And if I do have to switch to using prop() , all the old attr() calls will break if i switch to 1.6? UPDATE selector = '#id' $(selector).cl
所以jQuery 1.6有了新的函数prop() 。 $(selector).click(function(){ //instead of: this.getAttribute('style'); //do i use: $(this).prop('style'); //or: $(this).attr('style'); }) 或者在这种情况下,他们做同样的事情吗? 如果我必须切换到使用prop() ,如果我切换到1.6,所有旧的attr()调用都会中断吗? UPDATE selector = '#id' $(selector).click(function() { //instead of:
This question already has an answer here: .prop() vs .attr() 17 answers The attr method changes an element attribute, which is the initial state. The prop value changes the element property, which is the current state. To set the checked state, use the prop method: $('input[name=giustificaEntrata]').prop('checked', true);' To select an option, use the val method: $('select[name=pippo]')
这个问题在这里已经有了答案: .prop()vs .attr()17答案 attr方法更改一个元素属性,这是初始状态。 prop值更改元素属性,即当前状态。 要设置选中的状态,请使用prop方法: $('input[name=giustificaEntrata]').prop('checked', true);' 要选择一个选项,请使用val方法: $('select[name=pippo]').val('beta'); 复选框checked属性基本上有两种状态。 检查 - 真实和检查 - 错误。 从道具文档,根据W3C形式规范