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数组比较取值根据需求分为取单个值和取多个值

单

```javascript
let c = [];        
let tmp = arr1.concat(arr2);      
 let o = {};        
 for (let s = 0; s < tmp.length; s++) {       
   (tmp[s] in o) ? o[tmp[s]]++ : o[tmp[s]] = 1;      
 }       
 for (let x in o) {
   if (o[x] == 1) {
     c = x;
   }
 } 

多

```javascript
  arrayRepeat(array1, array2) {
     let c = [...array1, ...array2],
      d = new Set(c),
      e = Array.from(d),
      f = [...e.filter(_=>!array1.includes(_)),...e.filter(_=>!array2.includes(_))]
      return f
   },