2.2.4 提问:谈谈 JavaScript 中的闭包是什么,以及它的优缺点是什么?
JavaScript中的闭包在JavaScript中,闭包是指在函数内部定义的函数,可以访问外部函数作⽤域的变量。闭包可以将变量私有化,同时仍然可以在内部函数中使⽤。例如:function outerFunction() { let outerVar = 10;function innerFunction() { return outerVar;}return innerFunction; }let closure = outerFunction(); console.log(closure()); // 输出 10闭包的优点可以实现数据封装和隐藏可以延长变量的⽣命周期可以实现模块化编程闭包的缺点可能导致内存泄漏可能增加代码复杂度可能影响性能
10 Screens$8,029
I will design rough sketches for upto 5 Screens of your website/Mobile app.
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20 Screens$16,029
I will design rough sketches for upto 5 Screens of your website/Mobile app.
- Source File
- Commercial Use
- Interactive Mockup
- 10 Pages
30 Screens$24,029
I will design rough sketches for upto 5 Screens of your website/Mobile app.
- Source File
- Commercial Use
- Interactive Mockup
- 10 Pages