This question already has an answer here: What is the most efficient way to deep clone an object in JavaScript? 57 answers Is JavaScript a pass-by-reference or pass-by-value language? 29 answers The get method in the proceeding line returns a reference to the layerIds object within the model: var d = this.model.get('layerIds'); When the maplayer property on d is set the reference is als
这个问题在这里已经有了答案: 在JavaScript中深入克隆对象的最有效方法是什么? 57个答案 JavaScript是传递引用还是传值语言? 29个答案 前进行中的get方法返回对模型中的layerIds对象的引用: var d = this.model.get('layerIds'); 当d上的maplayer属性被设置时,参考也被操纵。 基本上d和this.model.get('layerIds')将从内存中返回相同的对象。 d.mapLayer = view.getId(); 如果你检查了两者之间的平
This question already has an answer here: Is JavaScript a pass-by-reference or pass-by-value language? 29 answers Objects, including arrays are assigned by reference in ECMAScript. So, when you modify the array in the function you are modifying the same array as you passed into the function, not a new copy of the array. A quick way to perform a shallow copy of an array is using slice(0) (
这个问题在这里已经有了答案: JavaScript是传递引用还是传值语言? 29个答案 对象(包括数组)在ECMAScript中通过引用进行分配。 因此,当您在函数中修改数组时,您正在修改与传入函数相同的数组,而不是数组的新副本。 一个快速的方法来执行一个数组的浅拷贝是使用slice(0) (并在一些现代的引擎,你可以省略0 )。 看到这个关于复制数组的答案。 对于一些例子也请看这个答案。 var foo = [1,2,3]; bar = functi
This question already has an answer here: Is JavaScript a pass-by-reference or pass-by-value language? 29 answers When you call: x(a); A few things are going on. First, the variable a (which simply holds a reference to an object) is passed by value to the function x . x now has its own copy of that reference, which happens to point to the same object in memory. Thus, any changes you mak
这个问题在这里已经有了答案: JavaScript是传递引用还是传值语言? 29个答案 你打电话时: x(a); 有几件事正在发生。 首先,变量a (它只保存对象的引用)通过值传递给函数x 。 x现在有自己的那个引用副本,它恰好指向内存中的同一个对象。 因此,您对该引用对象的属性所做的任何更改都会影响对该对象的其他引用。 你打电话时: this.b = v; 您再次制作v的副本并将其设置为this.b 现在, a , v和this.b是内存
This question already has an answer here: Is JavaScript a pass-by-reference or pass-by-value language? 29 answers y[..] = ... is modifying an existing object. That change is visible to anything that holds a reference to that object. y = ... assigns an entirely new value to the local y variable and discards the previously assigned object reference. That change is not visible outside the f
这个问题在这里已经有了答案: JavaScript是传递引用还是传值语言? 29个答案 y[..] = ...正在修改现有的对象。 任何对该对象有引用的东西都可以看到这种变化。 y = ...将一个全新的值赋给本地y变量,并丢弃先前分配的对象引用。 该变化在函数外部是不可见的,因为没有其他变量可以访问y变量。
This question already has an answer here: Is JavaScript a pass-by-reference or pass-by-value language? 29 answers (Deep) copying an array using jQuery [duplicate] 8 answers Arrays are objects, unlike the primitive types like string, int, etc ... variables that take objects correspond to references (pointer) for objects, rather than the object itself, so different variables can reference th
这个问题在这里已经有了答案: JavaScript是传递引用还是传值语言? 29个答案 (深)复制数组使用jQuery [复制] 8个答案 数组是对象,与字符串,int等基本类型不同,接受对象的变量对应于对象的引用(指针),而不是对象本身,因此不同的变量可以引用相同的对象。 基本类型变量(字符串,int等)与值相关联。 在你的情况下,你将不得不克隆你的对象数组具有相同的值。 var Mycollection = new Array("James","Jonh",
This question already has an answer here: Is JavaScript a pass-by-reference or pass-by-value language? 29 answers 你应该在你的函数中克隆(创建一个你的数组的副本) function bake_goods(my_pizza, my_pie){ var innerPizza = my_pizza.slice(0); console.log(innerPizza); console.log(my_pie); delete innerPizza ['1']; my_pie = "peach"; console.log(innerPizza ); console.log(
这个问题在这里已经有了答案: JavaScript是传递引用还是传值语言? 29个答案 你应该在你的函数中克隆(创建一个你的数组的副本) function bake_goods(my_pizza, my_pie){ var innerPizza = my_pizza.slice(0); console.log(innerPizza); console.log(my_pie); delete innerPizza ['1']; my_pie = "peach"; console.log(innerPizza ); console.log(my_pie); } 数组和对象作为指向原始对象
This question already has an answer here: Is JavaScript a pass-by-reference or pass-by-value language? 29 answers Your function is swapping the values internally, but the function does not return a value. The following method returns an array of values in reverse order of what was supplied. function swap(x, y) { var t = x; x = y; y = t; return [x, y]; } console.log
这个问题在这里已经有了答案: JavaScript是传递引用还是传值语言? 29个答案 你的函数在内部交换值,但函数不会返回一个值。 以下方法以与提供的内容相反的顺序返回值数组。 function swap(x, y) { var t = x; x = y; y = t; return [x, y]; } console.log(swap(2, 3)); 如果你实际上不需要交换值: function swap (x, y) { return [y, x]; } 如果您确实需要交换值,但您不想声明另一个
This question already has an answer here: Is JavaScript a pass-by-reference or pass-by-value language? 29 answers The modifyTest function is essentially creating a local, function-level variable called s ; that variable only exists within the scope of the function, so modifying it will not effect external scope. If you want to modify the external scope, you would not use an argument: var
这个问题在这里已经有了答案: JavaScript是传递引用还是传值语言? 29个答案 modifyTest函数本质上是创建一个名为s的本地函数级变量; 该变量只存在于该函数的范围内,因此修改它不会影响外部范围。 如果你想修改外部作用域,你不会使用参数: var test = "This is a simple test"; function modifyTest(){ test = "modified test text"; } console.log(test); // This is a simple test modifyTest(); console.
This question already has an answer here: Is JavaScript a pass-by-reference or pass-by-value language? 29 answers Objects and arrays are treated as references to the same object. If you want to clone the object, there are several ways to do this. In later browsers, you can do: var b = Object.assign({}, a); If you want to go for a library, lodash provides _.clone (and _.cloneDeep ): var
这个问题在这里已经有了答案: JavaScript是传递引用还是传值语言? 29个答案 对象和数组被视为对同一对象的引用。 如果你想克隆这个对象,有几种方法可以做到这一点。 在以后的浏览器中,你可以这样做: var b = Object.assign({}, a); 如果你想去图书馆,lodash提供_.clone (和_.cloneDeep ): var b = _.clone(a); 如果您不想执行这两种方法中的任何一种,则可以枚举每个键和值,并将它们分配给一个新对象。
I'm making a project for school where we'll teach children to calculate for the first time. Unfortunately these children can't read so the task will be spoken to them in there native language, which in this case is Dutch. I've been looking around and most text-to-speech javascript libs provide great support for English, but not for any other language. Also the HTML5 speechSynt
我正在为学校制定一个项目,我们将首先教孩子们计算。 不幸的是,这些孩子无法阅读,因此将以母语(在这种情况下是荷兰语)向他们讲述任务。 我一直在环顾四周,大多数的文本到语音的JavaScript库提供了很好的英语支持,但不适用于任何其他语言。 此外,HTML5语音合成不支持荷兰语: 在进一步的研究中,我遇到了一篇文章,您可以使用Google翻译语音将任何文本生成为语音。 您将其作为基本网址:http://translate.google.