【JavaScript】JS提取任意两个数组的公共部分（超简单）【原创】

var a = [1,2,3,1,2,6,7,7,88,7,6];
var b = [1,2,4,6,3,5,6,6,7,5,3,2 ];
console.log(arr( a , b ));

function arr( arr1, arr2){
   var arr = [];
   if(arr1.length > arr2.length){
        for( var i in arr1 ){
            if(arr2.indexOf(arr1[i]) != "-1"){
                if(arr.indexOf(arr1[i]) == "-1"){                               
                    arr.push(arr1[i]);
                }
            }
        };
    }else{
        for( var i in arr2 ){
            if(arr1.indexOf(arr2[i]) != "-1"){
                if(arr.indexOf(arr2[i]) == "-1"){                               
                    arr.push(arr2[i]);;
                }
            }
        };
    }
    return arr;
}