数组去重

普通数组去重

Array.prototype.unique = function(){
 var res = [];
 var json = {};
 for(var i = 0; i < this.length; i++){
  if(!json[this[i]]){
   res.push(this[i]);
   json[this[i]] = 1;
  }
 }
 return res;
}
var arr = [112,112,34,'你好',112,112,34,'你好','str','str1'];
alert(arr.unique());

 json数组去重

arr=[{FromStation:'杭州'，ToStation:'北京'}，{FromStation:'杭州'，ToStation:'北京'}，{FromStation:'上海'，ToStation:'北京'}，{FromStation:'杭州'，ToStation:'南京'}]

function unique(arr){
    let newArr = [arr[0]];
    for(let i = 1; i < arr.length; i++){
        let Item = arr[i];
        let repeat = false;
        for (let j = 0; j < newArr.length; j++) {
          if (Item.FromStation == newArr[j].FromStation && Item.ToStation == newArr[j].ToStation) {
                 repeat = true;
                 break;
          }
     }
              if (!repeat) {
                  newArr.push(Item);
              }
    }
    return newArr;
}

unique(arr) // arr=[{FromStation:'杭州'，ToStation:'北京'}，{FromStation:'上海'，ToStation:'北京'}，{FromStation:'杭州'，ToStation:'南京'}]