要領1:
ES6新特徵
Set

 Array.prototype.rmSome = function() {
     return Array.from(new Set(this));
  }

要領2:應用對象名唯一

Array.prototype.rmSome = function() {
 let tempObj = {}
 this.forEach(item => {
     if (tempObj[item]) {
         return
     } else {
         tempObj[item] = item;
     }
 })
return Object.values(tempObj)
  }

要領3:應用數組包括
[].includes [].indexOf

Array.prototype.rmSome = function () {
 let tempArr = [];
 this.forEach((item, index) => {
     if (tempArr.includes(item)) {
         return
     } else {
         tempArr.push(item)
     }
 })
 return tempArr
}

要領4: 排序比較兄弟元素

Array.prototype.rmSome = function () {
 const tempArr = this.sort();
 tempArr.forEach((item, index) => {
     for (let i = 0; i < tempArr.length; i++) {
         if (tempArr[i] == tempArr[i + 1]) {
             tempArr.splice(i, 1);
             i--;
         }
     }
 })
 return tempArr
}

要領5: 雙循環比較

  Array.prototype.rmSome = function () {
 for (let i = 0; i < this.length; i++) {
     const node = this[i];
     for (let j = i + 1; j < this.length; j++) {
         if (node === this[j]) {
             this.splice(j, 1);
             j--;
         }
     }
 }
 return this
}