js同数组去重

1、一维数组去重

var arr1 = ['中国','美国','英国','中国','法国','美国']
function unique(arr) {
  var newArr = [];
  for (var i = 0; i < arr.length; i++) {
  	if (newArr.indexOf(arr[i]) == -1) {
  	  newArr.push(arr[i])
  	}
  }
  return newArr;
}

console.log('输出结果', unique(arr1))
//输出结果 (4) ['中国', '美国', '英国', '法国']

2、多维数组去重

var arr2 = [{id:1,name:'李白',age:'23'},{id:2,name:'张三',age:'25'},{id:3,name:'李白',age:'23'},{id:4,name:'马武',age:'23'}]
function noRepeat(arr, name) {
  for (var i = 0; i < arr.length - 1; i++) {
  	for (var j = i + 1; j < arr.length; j++) {
  	  if (arr[i][name] === arr[j][name]) {
  	  	arr.splice(j, 1);
  	  	j--;
  	  }
  	}
  }
  return arr;
}

console.log('输出结果', noRepeat(arr2,'name'))
//0: {id: 1, name: '李白', age: '23'}
//1: {id: 2, name: '张三', age: '25'}
//2: {id: 4, name: '马武', age: '23'}