JavaScript面试题区别的相关内容

文章 2022-08-23 来自：开发者社区

JavaScript相关面试题:1.js垃圾回收机制；2.闭包；3.为什么不建议使用innerHTML；4.null和undefined的区别；5.new 操作符

文章目录JS 有哪些垃圾回收机制？说说你对闭包的理解为什么不建议在 JavaScript 中使用 innerHTML?null和undefined的区别是什么?new 操作符的作用是什么？JS 有哪些垃圾回收机制？:有以下垃圾回收机制。●标记清除(markandsweep)这是JavaScript 最常见的垃圾回收方式。当变量进入执行环境的时候，比如在函数中声明一个变量，垃圾回收器将其标记为“进....

文章 2022-08-23 来自：开发者社区

JavaScript相关面试题2:1.深拷贝和浅拷贝区别；2. [“1“,“2“,“3“].map(parselInt)的返回值；3.预防按钮的重复点击

文章目录深拷贝浅拷贝有什么区别?怎么实现深拷贝?["1","2","3"].map(parselInt)的返回值是什么?怎么预防按钮的重复点击?深拷贝浅拷贝有什么区别?怎么实现深拷贝?浅拷贝浅拷贝，指的是创建新的数据，这个数据有着原始数据属性值的一份精确拷贝如果属性是基本类型，拷贝的就是基本类型的值。如果属性是引用类型，拷贝的就是内存地址即浅拷贝是拷贝一层，深层次的引用类型则共享内存地址下面简单....

文章 2022-08-23 来自：开发者社区

JavaScript相关面试题4:1.ajax、axios、fetch区别；2.Object与Map区别

文章目录ajax、axios、fetch有什么区别? .（1）AJAX（2）Fetch（3）AxiosObject与Map有什么区别?ObjectMap访问赋值删除大小迭代使用场景ajax、axios、fetch有什么区别? .（1）AJAXAjax 即“AsynchronousJavascriptAndXML”（异步 JavaScript 和 XML），是指一种创建交互式网页应用的网页开发技术....

文章 2022-08-23 来自：开发者社区

JavaScript面试题6:1.遍历数组的方式；2.连续bind()多次,输出的值；3.new fn与new fn()的区别

文章目录遍历数组的方式有哪些?连续bind()多次,输出的值是什么?new fn与new fn()有什么区别吗?遍历数组的方式有哪些?forvar arr = [1,2,3,4,5]for(var i=0;i<arr.length;i++){ console.log(arr[i])}1234forEach对数组中的每一元素运行给定的函数,没有返回值，常用来遍历元素var arr....

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