vue hello world项目
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

24 lines
808 B

3 years ago
var global = require('../internals/global');
var isArray = require('../internals/is-array');
var isConstructor = require('../internals/is-constructor');
var isObject = require('../internals/is-object');
var wellKnownSymbol = require('../internals/well-known-symbol');
var SPECIES = wellKnownSymbol('species');
var Array = global.Array;
// a part of `ArraySpeciesCreate` abstract operation
// https://tc39.es/ecma262/#sec-arrayspeciescreate
module.exports = function (originalArray) {
var C;
if (isArray(originalArray)) {
C = originalArray.constructor;
// cross-realm fallback
if (isConstructor(C) && (C === Array || isArray(C.prototype))) C = undefined;
else if (isObject(C)) {
C = C[SPECIES];
if (C === null) C = undefined;
}
} return C === undefined ? Array : C;
};