js项目中常用算法

var arr = [1,2,3,4,4,2,2,6,9,1,0];var newArr = [];var onOff = true;for(var i = 0;i<arr.length;i++){
 onOff = true; for(var j = 0;j<newArr.length;j++){ if(newArr[j]==arr[i]){
 onOff = false;
 }
 } if(onOff){
 newArr.push(arr[i]);
 }
}console.log(newArr)

function shuffle(arr) { var i = arr.length, t, j; while (i) {
 j = Math.floor(Math.random() * i--);
 t = arr[i];
 arr[i] = arr[j];
 arr[j] = t;
 } console.log(arr)
}var arr = [1, 3, 5, 7, 9]
shuffle(arr)

var str = 'abcdefffdddddd';var obj={};for(var i=0;i<str.length;i++){ var t = str[i]; if(obj[t]){
 obj[t]++;
 }else{
 obj[t] = 1;
 }
}console.log(obj);var max=0,tKey;for(key in obj){ if(obj[key] > max){
 max = obj[key];
 tKey = key;
 }
}console.log(tKey)