数组对象去重处理 +（javascript 判断某个数组中是否包含另一个数组）

1,数组对象去重处理

this.json_sn = [{'institution_name':'GeeL',id:2} ,{'institution_name':'GeeL',id:3}, {'institution_name':'GeeLQ',id:4}]

var hash = {};

this.json_sn = this.json_sn.reduce(function (item, next) {                     

hash[next.institution_name] ? '' : hash[next.institution_name] = true && item.push(next);

        return item;

}, [])

console.log('去重has',hash,this.json_sn)

2,javascript 判断某个数组中是否包含另一个数组

//是否被包含,是返回true,不是返回false

isContained =(a, b)=>{

    if(!(a instanceof Array) || !(b instanceof Array)) return false;

    if(a.length < b.length) return false;

    var aStr = a.toString();

    for(var i = 0, len = b.length; i < len; i++){

      if(aStr.indexOf(b[i]) == -1) return false;

    }

    return true;

  }

var a = [1,2,3,4,5];

var b = [1,4,3,2];

var c = [1,6];

alert(isContained(a,b));       //true  

alert(isContained(a,c));        //false