我有两个JavaScript数组：
var array1 = ["Vijendra","Singh"];
var array2 = ["Singh", "Shakya"];
我希望输出为：
var array3 = ["Vijendra","Singh","Shakya"];
输出数组应删除重复的单词。
如何在JavaScript中合并两个数组，以便从每个数组中只获得唯一的项目，其顺序与它们插入原始数组的顺序相同？
当前回答
如果不希望复制特定属性（例如ID）
let noDuplicate = array1.filter ( i => array2.findIndex(a => i.id==a.id)==-1 );
let result = [...noDuplicate, ...array2];
其他回答
Array.prototype.union = function (other_array) {
/* you can include a test to check whether other_array really is an array */
other_array.forEach(function(v) { if(this.indexOf(v) === -1) {this.push(v);}}, this);
}
//Array.indexOf was introduced in javascript 1.6 (ECMA-262)
//We need to implement it explicitly for other browsers,
if (!Array.prototype.indexOf)
{
Array.prototype.indexOf = function(elt, from)
{
var len = this.length >>> 0;
for (; from < len; from++)
{
if (from in this &&
this[from] === elt)
return from;
}
return -1;
};
}
//now, on to the problem
var array1 = ["Vijendra","Singh"];
var array2 = ["Singh", "Shakya"];
var merged = array1.concat(array2);
var t;
for(i = 0; i < merged.length; i++)
if((t = merged.indexOf(i + 1, merged[i])) != -1)
{
merged.splice(t, 1);
i--;//in case of multiple occurrences
}
其他浏览器的indexOf方法的实现取自MDC
只需使用Undercore.js的=>uniq即可实现：
array3 = _.uniq(array1.concat(array2))
console.log(array3)
它将印刷[“Vijendra”、“Singh”、“Shakya”]。
最好也是最简单的方法是使用JavaScript的函数“some（）”，该函数返回true或false，指示数组是否包含对象的元素。您可以这样做：
var array1 = ["Vijendra","Singh"];
var array2 = ["Singh", "Shakya"];
var array3 = array1;
array2.forEach(function(elementArray2){
var isEquals = array1.some(function(elementArray1){
return elementArray1 === elementArray2;
})
if(!isEquals){
array3.push(elementArray2);
}
});
console.log(array3);
结果：
["Vijendra", "Singh", "Shakya"]
如你所愿。。。无需复制。。。
这是我需要合并（或返回两个数组的并集）时使用的函数。
var union = function (a, b) {
for (var i = 0; i < b.length; i++)
if (a.indexOf(b[i]) === -1)
a.push(b[i]);
return a;
};
var a = [1, 2, 3, 'a', 'b', 'c'];
var b = [2, 3, 4, 'b', 'c', 'd'];
a = union(a, b);
//> [1, 2, 3, "a", "b", "c", 4, "d"]
var array1 = ["Vijendra", "Singh"];
var array2 = ["Singh", "Shakya"];
var array3 = union(array1, array2);
//> ["Vijendra", "Singh", "Shakya"]
