2020-08-21 HTML a tag href is empty + css learning method + path query of JS implementation tree + understanding of end-to-end delivery of soft skills

2020-08-21 Subject source: http://www.h-camel.com/index.html

[html] Tell me what will happen if a link href="" (empty) is clicked?

The performance is: refresh the page

Generally, when the a tag is used as a button, the href value is empty when there is no need to jump.

If you do not need to jump, you need to set the value of href: <a href="javascript:void(0);">链接</a>

[css] How did you learn css? Talk about your learning method

Read more write more

[js] Write a method to implement tree path query [code]

const binaryTree = {
  id: 1,
  left: {
    id: 2,
    left: {
      id: 4,
      left: {
        id: 7,
        left: null,
        right: null
      },
      right: {
        id: 5,
        left: null,
        right: null
      }
    },
    right: {
      id: 8,
      left: null,
      right: null
    }
  },
  right: {
    id: 3,
    left: null,
    right: {
      id: 9,
      left: null,
      right: null
    }
  }
}

// 根据给定值，查找叶子节点（返回叶子节点和路径）
   function searchLeaves (tree, key, pathList) {  // 此方法只有两种返回值（Array、null）
      if (!tree) return null
// 此方法是递归调用，考虑到首次不传pathList参数，此处做个判断
      if (!pathList) pathList = []

      pathList.push(tree.id)

      if (tree.id === key) return pathList

      let found
      found = this.searchLeaves(tree.left, key, pathList)
      if (found) return found
      found = this.searchLeaves(tree.right, key, pathList)
      if (found) return found
//执行到此处，说明当前节点的子树没找到，将当前节点pop出去
      pathList.pop()  
      return found
    }

let searchId = 5
let result = searchLeaves(binaryTree,searchId)

console.log(result)
// 输出 [1,2,4,5]

Transfer from https://blog.csdn.net/ulanlds/article/details/108463394

Another article to implement binary tree search https://blog.csdn.net/weixin_36185028/article/details/53967888

[Soft Skills] Tell me about your understanding of end-to-end delivery

End-to-end delivery actually refers to end-to-end contract delivery, with the contract as the main line, including the entire process of project initiation, bidding, contract signing, manufacturing/delivery/project preparation, project implementation and contract closure.

Demystifying: What exactly is Huawei's end-to-end delivery? https://www.jianshu.com/p/f19bf8444f0b