我需要二维数组,所以我创建了一个嵌套数组,因为 JavaScript 不允许它们。
它们看起来像这样:
var myArray = [
[1, 0],
[1, 1],
[1, 3],
[2, 4]
]
如何检查此数组是否包含[0,1]vanilla JS 中的特定元素(即这些数组之一)?
这是我尝试过的,但没有成功(一切都返回false)(编辑:我在代码段中包含了答案):
var myArray = [
[1, 0],
[1, 1],
[1, 3],
[2, 4]
]
var itemTrue = [2, 4];
var itemFalse = [4, 4];
function contains(a, obj) {
var i = a.length;
while (i--) {
if (a[i] === obj) {
return true;
}
}
return false;
}
// EDIT: first answer's solution
function isArrayInArray(x, check) {
for (var i = 0, len = x.length; i < len; i++) {
if (x[i][0] === check[0] && x[i][1] === check[1]) {
return true;
}
}
return false;
}
// EDIT: accepted answer's solution
function isArrayInArray2(x, check) {
var result = x.find(function(ele) {
return (JSON.stringify(ele) === JSON.stringify(check));
})
return result !=null
}
console.log("true :" + myArray.includes(itemTrue));
console.log("false :" + myArray.includes(itemFalse));
console.log("true :" + (myArray.indexOf(itemTrue) != -1));
console.log("false :" + (myArray.indexOf(itemFalse) != -1));
console.log("true :" + contains(myArray, itemTrue));
console.log("false :" + contains(myArray, itemFalse));
// EDIT: first answer's solution
console.log("true :" + isArrayInArray(myArray, itemTrue));
console.log("false :" + isArrayInArray(myArray, itemFalse));
// EDIT: accepted answer's solution
console.log("true :" + isArrayInArray2(myArray, itemTrue));
console.log("false :" + isArrayInArray2(myArray, itemFalse));
它可能看起来像重复,但我找不到类似的问题。如果是,请随意标记它。