算法题：

  • 链接：https://leetcode-cn.com/problems/intersection-of-two-linked-lists/
  • 给你两个单链表的头节点 headA 和 headB ，请你找出并返回两个单链表相交的起始节点。如果两个链表不存在相交节点，返回 null 。
  • 解答
    1. var getIntersectionNode = function(headA, headB) {
    2. const result = new Set()
    3. let tmp = headA
    4. while (tmp) {
    5.     result.add(tmp)
    6.     tmp = tmp.next
    7. }
    8. tmp = headB
    9. while (tmp) {
    10.     if (result.has(tmp)) {
    11.         return tmp
    12.     }
    13.     tmp = tmp.next
    14. }
    15. return null
    16. };

手写题：实现一个可以拖拽的DIV

  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <meta http-equiv="X-UA-Compatible" content="IE=edge">
  6.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  7.     <title>Document</title>
  8. </head>
  9. <style>
  10.     * {
  11.         padding: 0;
  12.         margin: 0;
  13.     }
  15.     #box {
  16.         position: absolute;
  17.         left: 500px;
  18.         top: 400px;
  19.         height: 100px;
  20.         width: 100px;
  21.         background: orangered;
  22.         border-radius: 8px;
  23.         cursor: pointer;
  24.     }
  25. </style>
  27. <body>
  28.     <div id="box"></div>
  29.     <script>
  30.         let box = document.getElementById('box')
  31.         let ox,oy,px,py
  32.         // 鼠标按下
  33.         box.onmousedown = function (e) {
  34.             ox = parseInt( box.offsetLeft)
  35.             oy =  parseInt(box.offsetTop)
  36.             px = e.pageX
  37.             py = e.pageY
  38.             document.onmousemove = move
  39.             document.onmouseup = stop
  40.         }
  41.         function move(e) {
  42.             box.style.left = e.pageX+ox - px+'px'
  43.             box.style.top = e.pageY+oy-py+'px'
  44.         }
  45.         function stop(e) {
  46.             ox = parseInt( box.offsetLeft)
  47.             oy =  parseInt(box.offsetTop)
  48.             px = e.pageX
  49.             py = e.pageY
  50.             document.onmouseup = null
  51.             document.onmousemove = null
  52.         }
  53.     </script>
  54. </body>
  55. </html>