我有一个目标数组[“apple”、“banana”、“orange”]，我想检查其他数组是否包含任何一个目标阵列元素。
例如：
["apple","grape"] //returns true;
["apple","banana","pineapple"] //returns true;
["grape", "pineapple"] //returns false;
如何在JavaScript中实现？
当前回答
香草js
/**
* @description determine if an array contains one or more items from another array.
* @param {array} haystack the array to search.
* @param {array} arr the array providing items to check for in the haystack.
* @return {boolean} true|false if haystack contains at least one item from arr.
*/
var findOne = function (haystack, arr) {
return arr.some(function (v) {
return haystack.indexOf(v) >= 0;
});
};
正如@loganofsmyth所指出的，您可以在ES2016中将其缩短为
/**
* @description determine if an array contains one or more items from another array.
* @param {array} haystack the array to search.
* @param {array} arr the array providing items to check for in the haystack.
* @return {boolean} true|false if haystack contains at least one item from arr.
*/
const findOne = (haystack, arr) => {
return arr.some(v => haystack.includes(v));
};
或者简单地称为arr.some（v＝＞haystalk.includes（v））；
如果要确定数组是否包含其他数组中的所有项，请将some（）替换为every（）或作为arr.every（v＝＞haystalk.includes（v））；
其他回答
console.log("searching Array: "+finding_array);
console.log("searching in:"+reference_array);
var check_match_counter = 0;
for (var j = finding_array.length - 1; j >= 0; j--)
{
if(reference_array.indexOf(finding_array[j]) > 0)
{
check_match_counter = check_match_counter + 1;
}
}
var match = (check_match_counter > 0) ? true : false;
console.log("Final result:"+match);
香草js
/**
* @description determine if an array contains one or more items from another array.
* @param {array} haystack the array to search.
* @param {array} arr the array providing items to check for in the haystack.
* @return {boolean} true|false if haystack contains at least one item from arr.
*/
var findOne = function (haystack, arr) {
return arr.some(function (v) {
return haystack.indexOf(v) >= 0;
});
};
正如@loganofsmyth所指出的，您可以在ES2016中将其缩短为
/**
* @description determine if an array contains one or more items from another array.
* @param {array} haystack the array to search.
* @param {array} arr the array providing items to check for in the haystack.
* @return {boolean} true|false if haystack contains at least one item from arr.
*/
const findOne = (haystack, arr) => {
return arr.some(v => haystack.includes(v));
};
或者简单地称为arr.some（v＝＞haystalk.includes（v））；
如果要确定数组是否包含其他数组中的所有项，请将some（）替换为every（）或作为arr.every（v＝＞haystalk.includes（v））；
带下划线js
var a1 = [1,2,3];
var a2 = [1,2];
_.every(a1, function(e){ return _.include(a2, e); } ); //=> false
_.every(a2, function(e){ return _.include(a1, e); } ); //=> true
这可以通过简单地遍历主数组并检查其他数组是否包含任何目标元素来完成。
试试看：
function Check(A) {
var myarr = ["apple", "banana", "orange"];
var i, j;
var totalmatches = 0;
for (i = 0; i < myarr.length; i++) {
for (j = 0; j < A.length; ++j) {
if (myarr[i] == A[j]) {
totalmatches++;
}
}
}
if (totalmatches > 0) {
return true;
} else {
return false;
}
}
var fruits1 = new Array("apple", "grape");
alert(Check(fruits1));
var fruits2 = new Array("apple", "banana", "pineapple");
alert(Check(fruits2));
var fruits3 = new Array("grape", "pineapple");
alert(Check(fruits3));
JSFIDDLE演示
良好的性能解决方案：
我们应该将其中一个数组转换为对象。
const contains = (arr1, mainObj) => arr1.some(el => el in mainObj);
const includes = (arr1, mainObj) => arr1.every(el => el in mainObj);
用法：
const mainList = ["apple", "banana", "orange"];
// We make object from array, you can use your solution to make it
const main = Object.fromEntries(mainList.map(key => [key, true]));
contains(["apple","grape"], main) // => true
contains(["apple","banana","pineapple"], main) // => true
contains(["grape", "pineapple"], main) // => false
includes(["apple", "grape"], main) // => false
includes(["banana", "apple"], main) // => true
您可能会面临由in运算符检查的一些缺点（例如｛｝//=>true中的“toString”），因此您可以将解决方案更改为obj[key]检查器
