前端笔试题

谁借莪１个温暖的怀抱￠ 2023-02-28 01:58 78阅读 0赞

1.输出多少

  1. alert(typeof(NaN)) //number
  2. alert(typeof(undefined)) //undefined
  3. alert(typeof(null)) // object

2.Foo.getName()

https://www.cnblogs.com/laojun/p/8287399.html

3.三种方式实现4评分一个div的布局

https://blog.csdn.net/weixin_40372161/article/details/80934448?utm_medium=distribute.pc_relevant.none-task-blog-baidujs-2

4.es5和es6数组去重的方法

  1. var arr =[5,'5',2,'2',1]
  2. function unique(arr){
  3.  var brr =[]
  4.      obj={}
  5.  for( var i=0;i<arr.length;i++){
  6.      if(!obj[arr[i]]){
  7.       obj[arr[i]]=true
  8.       brr.push(arr[i])
  9.   }
  10.  }
  11. console.log(brr)
  12. }
  13. unique(arr)
  15. var arr =[5,'5',2,'2',1]
  16. let a = arr.filter((item,index,self)=>{
  17.   return self.indexOf(item) ==index
  18. })
  20. var arr =[5,'5',2,'2',1]
  21. var set = new Set(arr)
  22. console.log(set)

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js没有浮点类型 先转换成十进制

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0 1

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1

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1,12,2

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变量提升 true jack js不是块级作用域

编写 b继承 a的方法 用原型继承

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