其中问到以下内容
pdf签名实现过程
pdf与图片的区别
图表之间进行多级联动的实现方式

  1. sum(1,3)(1).sumOf() // 5
  2. sum(1)(2)(3).sumOf() // 6
  3. function sum (...args) {
  4.   const nums = [];
  5.   function computed (...args) {
  6.     nums.push(...args);
  7.     return computed
  8.   }
  9.   computed.sumOf = function () { console.log(nums.reduce((res, cur) => res + cur)) }
  10.   return computed(...args);
  11. }
  1. <div class="switch"></div>
  2. .switch {
  3.   width: 3rem;
  4.   height: 1.6rem;
  5.   border-radius: 10px;
  6.   background: red;
  7.   overflow: hidden;
  8. }
  10. .switch:active::before {
  11.   left: 100%;
  12.   margin-left: -1.6rem;
  13. }
  15. .switch::before {
  16.   content: \'\';
  17.   display: block;
  18.   position: relative;
  19.   transition: all .3s;
  20.   left: 0;
  21.   margin-left: 1px;
  22.   height: calc(1.6rem - 2px);
  23.   width: calc(1.6rem - 2px);
  24.   border-radius: 100%;
  25.   margin-top: 1px;
  26.   background: black;
  27. }
  1. function Schehler {
  2.   list = [];
  3.   count = 0;
  4.   constructor(num) {
  5.     this.num = num;
  6.   }
  7.   async add (fn) {
  8.    this.count >= this.num ? await new Promise(resolve => this.list.push(resolve)) : \'\';
  9.    ++this.count;
  10.    const result = await fn();
  11.    --this.count;
  12.    if (this.list.length > 0) this.list.shift()();
  13.    return result;
  14.   }
  15. }
  1. const send = XMLHttpRequest.prototype.send;
  2. XMLHttpRequest.prototype.send = function (...args) { console.log(args); send(...args); }

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