2023最新前端面试题总结
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2023-05-30
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目录
1. 浏览器兼容性 ...................................................................................3
2. 如果没有文档类型声明，那么浏览器会怎么处理........................3
3. 如何理解层叠 ...................................................................................3
4. 一个标记样式的来源 .......................................................................3
5. margin 计算.......................................................................................3
6. 元素按照 display 值分为两类..........................................................3
7. 文档流...............................................................................................3
8. 元素浮动后的三大变化 ...................................................................4
9. 9. CSS 样式初始化： ........................................................................4
10. 10.BFC................................................................................................4
11. 清除浮动影响/解决塌陷..................................................................4
12. position:relative/absolute/fixed 的区别...........................................4
13. css 选择器优先级计算方法 .............................................................5
14. 一个盒子实际宽度或高度 ...............................................................5
15. css 盒模型 .........................................................................................5
16. css 兼容性 .........................................................................................5
17. Css 层 水平层叠...............................................................................6
18. JavaScript 兼容性..............................................................................6
19. javascript 执行流程...........................................................................7
20. Typeof 与 instanceof 区别 ................................................................7
21. 当做条件判断是 false.......................................................................7
22. undefined 和 null 区别: ..................................................................7
23. 事件绑定方式 ...................................................................................7
24. this 指向问题? ..................................................................................8
25. cookie 和 webStorage 区别: .............................................................8
26. 为什么需要将 DOM 对象里面的属性封装成方法，DOM 对象的方
法重新进行封装？...........................................................................................8
27. 不定宽高水平垂直居中问题 ...........................................................8
28. ecmascript 和 javascript 区别...........................................................9
29. 闭包...................................................................................................9
30. 伪类和为元素的区别 .....................................................................10
31. 请你简述面向对编程 .....................................................................10
32. 面向对象的特点 .............................................................................11
33. 对象的继承 .....................................................................................11
34. json 前后端交互标准 .....................................................................11
35. ajax 执行流程--封装 .......................................................................12
36. 焦点轮播图 说思路和写代码 .......................................................13
37. 数组排序算法 .................................................................................14
38. 数组去重算法 .................................................................................16
39. 去抖和节流 .....................................................................................17
40. 图片懒加载和预加载 .....................................................................17
41. 浏览器缓存机制 .............................................................................17
42. http 协议及状态码 .........................................................................18
43. event loop........................................................................................19
44. 从输入 url 到页面呈现到用户面前都做了哪些事情（后面讲）20
45. 网站开发方向 .................................................................................20
46. HTML4 和 HTML5 区别 ...................................................................20
47. 45.CSS2 和 CSS3 区别 .....................................................................20
48. webpack3 和 webpack4 区别 .........................................................21
49. cookie、session、webStoreage、localStorage、 sessionStorage 区
别: 21
50. 响应式开发 .....................................................................................23
51. 箭头函数与普通函数的区别 .........................................................24
52. var let const .....................................................................................24
53. this.setState 参数个数....................................................................24
54. 网站性能优化 .................................................................................24
55. 大中型公司开发业务流程 .............................................................25
56. React 和 Vue 对比：.......................................................................25
57. 请描述一下 cookies,sessionStorage 和 localStorage 的区别？ ....25
58. Typescript ........................................................................................26
59. 纯函数和纯组件 .............................................................................26
60. 为什么 class App A 要大写？ .........................................................26
61. render 为什么有根元素？ .............................................................26
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