[2017] Tencent interview articles IMWeb front end of autumn trick Training Camp Questions

July 12

Questions

• A question: whether the site Logo should appear in the <h1> tag?

• Two questions: whether to support IE6?

Interview questions

• What is the box model?
  Answer: margin, border, padding, content; standard boxes and boxes weird

• ? Description of the difference between the src and href
  Answer: src introducing resources from outside, href page will guide external resources

• Description of synchronous and asynchronous difference?
  A: Synchronization: After the implementation of the current process, the next process to execute; asynchronous: the implementation of the current process does not affect the execution of a process

• How to add, remove, move, copy, create, and find nodes?
  A: add nodes appendChild, remove nodes removeChild, copy nodes clone, create createElement, find nodes parentNode,childNodes

Programming problem

• Find the location of elements in a given item in the array arr

编程思路:二分查找

function indexOf(arr, item) {
    var arr = arr.sort(function(a,b){
        return a-b;
    });
    function binSearch(arr,item){
        var upperBound = arr.length-1;
        var lowerBound = 0;
        while(lowerBound<=upperBound){
            var mid = Math.floor((upperBound+lowerBound)/2);
            if(arr[mid]<item){
                lowerBound=mid+1;
            }else if(arr[mid]>item){
                upperBound=mid-1;
            }else{
                return mid;
            }
        }
        return -1;
    };
    return binSearch(arr,item);
};
var line = readline();
var lastIndex = line.lastIndexOf(",");
var arr = line.slice(0,lastIndex).match(/\d/g);
var num = parseInt(line.slice(lastIndex+1));
indexOf(arr,num);

• Calculating the sum of a given array containing all elements arr

编程思路:迭代器简化代码量

function sum(arr) {
    function add(runningTotal,currentValue){
        return runningTotal+currentValue;
    }
    return arr.reduce(add);
}

This article is reproduced in: ape 2048⇨ https://www.mk2048.com/blog/blog.php?id=ha1k2bj2h0j