JS数组去重，删除对象属性

1.数组去重
var arr = ['apple','strawberry','banana','pear','apple','orange','orange','strawberry'];
 var r = arr.filter(function(element,index,self){
    return self.indexOf(element) === index;
  });
 console.log(r);

2.删除对象属性

var arr={
    a:1,
    b:2
  };
  delete arr.b;
  console.log(arr)