The JavaScript exception "is not iterable" occurs when the value which is given as the right-hand side offor...of, as argument of a function such asPromise.allorTypedArray.from, or as the right-hand side of an arraydestructuring assignment, is not aniterable object. Message TypeError: obje...
在JavaScript 编程中,“Uncaught TypeError: XYZ is not iterable” 是一种常见的错误。这种错误通常发生在试图对一个非可迭代对象进行迭代操作时。了解这种错误的成因和解决方法,对于编写健壮的代码至关重要。 常见场景 对非数组类型使用 for...of 循环 对非可迭代对象使用扩展运算符(spread operator) 在Promise.all...
The value which is given as the right-hand side offor...of, or as argument of a function such asPromise.allorTypedArray.from, or as the right-hand side of an arraydestructuring assignment, is not aniterable object. An iterable can be a built-in iterable type such asArray,StringorMap,...
自定义迭代器 从上面的例子中,我们就可以知道是通过通过迭代器工厂函数Symbol.iterator来生成迭代器,所以我们需要实现一个迭代器迭代器工厂函数,然后迭代器可以调用next方法,所以还需要实现一个next方法,至于迭代器工厂函数,实际上直接返回实例this。 计数器例子: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 cla...
在上面的示例中,key是 name,value 是 zhangsan。JSON 可以保存多个 key:value对: 复制 {"name":"zhangsan","age":18,"city":"beijing"} 1. 当然这只是一个简单的例子,在实际应用中 JSON 可能会多层嵌套。对象和数组是可以保存其他值的值,因此 JSON 数据可能会发生无限嵌套。这允许 JSON 描述大多数数据类型...
TypeError: 'x' is not iterable TypeError: More arguments needed TypeError: Reduce of empty array with no initial value TypeError: can't access dead object TypeError: can't access property "x" of "y" TypeError: can't define property "x": "obj" is not extensible ...
1; //Uncaught SyntaxError: Identifier 'a' has already been declaredconst b = 2;//不存在变量提升，因此块级作用域外层无法访问if(true){var bar = "bar";let baz = "baz";const qux = "qux";}console.log(bar);//barconsole.log(baz);//baz is not definedconsole.log(qux);//qux is not ...
在利用for-in循环遍历对象Dogh时，输出：name,age,color，calculate。而在用for-of循环直接遍历对象Dogha时，并没有达到预想的结果，而是提示：forloop.html:57 Uncaught TypeError: Dogha is not iterable。所以，如果要用for-of来遍历对象属性时，还需借助Object.key()方法。所以，遍历对象，for-in更显得简单...
isIterable(promises)) {thrownewError('params is not iterable')}在方法中有多条件判断时候，为了提高函数的可扩展性，考虑下是不是可以使用能否使用多态性来解决。// 地图接口可能来自百度，也可能来自谷歌const googleMap = {show: function (size) {console.log('开始渲染谷歌地图', size)); }};const ...
for/oflets you loop over data structures that are iterable such as Arrays, Strings, Maps, NodeLists, and more. Thefor/ofloop has the following syntax: for(variableofiterable) { //code block to be executed } variable- For every iteration the value of the next property is assigned to the...