Tencent's JavaScript face test

Today, sorting out their folders, found that once interviewed Tencent interns were asked to hang the face of the questions, I will be prepared for your reference. It was the handwriting code that was required. Khan, I was in a weak burst!

1, converts the given array to a random array

Array.prototype.shuffle=function () {
        var resultarr=[];
        var len=this.length;
    
        while (len) {
            var _index=parseint (Math.random () *len);
                Resultarr.push (This[_index])//Get one character in the array, put it in the new array for
            (var i=_index;i<len;i++) {//Backward forward move
                this[i]= THIS[I+1];
            }
            len--;
        }
        return resultarr;
    }
   var a=new Array (' 1 ', ' 2 ', ' 3 ', ' 4 ', ' 5 ', ' 6 ');
   Alert (A.shuffle ());

2, statistics the number of occurrences of each character in a given string

var a= "Aassdddffffffffggghhhjjjkkkll";
    function counts (str) {
        var obj={};
        for (Var i=0;i<str.length;i++) {
            if (!obj[str[i]]) {
                obj[str[i]]=1
            } else{
             obj[str[i]]++
            }
                
        }
        return obj;
    }
    
    Console.log (Counts (a));//object {a:2, s:2, D:3, F:8, G:3 ...}

See more highlights of this column: http://www.bianceng.cnhttp://www.bianceng.cn/webkf/script/

3, to judge the completion of JS code loading

function Dynamicload ()  
    {  
       var _doc=document.getelementsbytagname (' head ') [0];  
       var script=document.createelement (' script ');  
    
        Script.setattribute (' type ', ' text/javascript ');  
        Script.setattribute (' src ', ' jquery.js ');  
    
        _doc.appendchild (script);  
        Non ie IE        ,
        script.onload=script.onreadystatechange=function () {  
            //non ie IE               , this value is not determined        
           if (! this.readystate| | this.readystate== ' Loaded ' | | this.readystate== ' complete ') {  
             alert (' Done ');  
             Script.onload=script.onreadystatechange=null  
        }}  
        }  
    

4, three columns to achieve the layout:

<! DOCTYPE html>
 
Author: cnblogs Wimber