ReadonlylengthGets the length of the array. This is a number one higher than the highest element defined in an array.
ReadonlyrawIterator of values in the array.
Combines two or more arrays.
Additional items to add to the end of array1.
Combines two or more arrays.
Additional items to add to the end of array1.
Returns an iterable of key, value pairs for every entry in the array
Determines whether all the members of an array satisfy the specified test.
A function that accepts up to three arguments. The every method calls the predicate function for each element in the array until the predicate returns a value which is coercible to the Boolean value false, or until the end of the array.
OptionalthisArg: anyAn object to which the this keyword can refer in the predicate function. If thisArg is omitted, undefined is used as the this value.
Determines whether all the members of an array satisfy the specified test.
A function that accepts up to three arguments. The every method calls the predicate function for each element in the array until the predicate returns a value which is coercible to the Boolean value false, or until the end of the array.
OptionalthisArg: anyAn object to which the this keyword can refer in the predicate function. If thisArg is omitted, undefined is used as the this value.
OptionalthisArg: anyOptionalthisArg: anyReturns the elements of an array that meet the condition specified in a callback function.
A function that accepts up to three arguments. The filter method calls the predicate function one time for each element in the array.
OptionalthisArg: anyAn object to which the this keyword can refer in the predicate function. If thisArg is omitted, undefined is used as the this value.
Returns the elements of an array that meet the condition specified in a callback function.
A function that accepts up to three arguments. The filter method calls the predicate function one time for each element in the array.
OptionalthisArg: anyAn object to which the this keyword can refer in the predicate function. If thisArg is omitted, undefined is used as the this value.
Returns the value of the first element in the array where predicate is true, and undefined otherwise.
find calls predicate once for each element of the array, in ascending order, until it finds one where predicate returns true. If such an element is found, find immediately returns that element value. Otherwise, find returns undefined.
OptionalthisArg: anyIf provided, it will be used as the this value for each invocation of predicate. If it is not provided, undefined is used instead.
OptionalthisArg: anyReturns the value of the first element in the array where predicate is true, and undefined otherwise.
find 为数组中的每个元素（按升序）调用一次 predicate 函数，直到找到一个 predicate 返回 true 的元素。如果找到这样的元素，find 会立即返回该元素的值。否则，find 返回 undefined。
Returns the index of the first element in the array where predicate is true, and -1 otherwise.
find calls predicate once for each element of the array, in ascending order, until it finds one where predicate returns true. If such an element is found, findIndex immediately returns that element index. Otherwise, findIndex returns -1.
OptionalthisArg: anyIf provided, it will be used as the this value for each invocation of predicate. If it is not provided, undefined is used instead.
OptionalthisArg: anyfindIndex 为数组中的每个元素（按升序）调用一次 predicate 函数，直到找到一个 predicate 返回 true 的元素。如果找到这样的元素，findIndex 会立即返回该元素的索引。否则，findIndex 返回 -1。
Optionaldepth: numberCalls a defined callback function on each element of an array. Then, flattens the result into a new array. This is identical to a map followed by flat with depth 1.
A function that accepts up to three arguments. The flatMap method calls the callback function one time for each element in the array.
OptionalthisArg: ThisAn object to which the this keyword can refer in the callback function. If thisArg is omitted, undefined is used as the this value.
Calls a defined callback function on each element of an array. Then, flattens the result into a new array. This is identical to a map followed by flat with depth 1.
Performs the specified action for each element in an array.
A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the array.
OptionalthisArg: anyAn object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
Determines whether an array includes a certain element, returning true or false as appropriate.
The element to search for.
OptionalfromIndex: numberThe position in this array at which to begin searching for searchElement.
OptionalfromIndex: numberReturns the index of the first occurrence of a value in an array.
The value to locate in the array.
OptionalfromIndex: numberThe array index at which to begin the search. If fromIndex is omitted, the search starts at index 0.
OptionalfromIndex: numberAdds all the elements of an array separated by the specified separator string.
Optionalseparator: stringA string used to separate one element of an array from the next in the resulting String. If omitted, the array elements are separated with a comma.
Optionalseparator: stringReturns an iterable of keys in the array
Returns the index of the last occurrence of a specified value in an array.
The value to locate in the array.
OptionalfromIndex: numberThe array index at which to begin the search. If fromIndex is omitted, the search starts at the last index in the array.
Calls a defined callback function on each element of an array, and returns an array that contains the results.
A function that accepts up to three arguments. The map method calls the callbackfn function one time for each element in the array.
OptionalthisArg: anyAn object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
OptionalthisArg: anyCalls the specified callback function for all the elements in an array. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
A function that accepts up to four arguments. The reduce method calls the callbackfn function one time for each element in the array.
Calls the specified callback function for all the elements in an array. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
A function that accepts up to four arguments. The reduce method calls the callbackfn function one time for each element in the array.
If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of an array value.
Calls the specified callback function for all the elements in an array. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
Calls the specified callback function for all the elements in an array. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
Calls the specified callback function for all the elements in an array, in descending order. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
A function that accepts up to four arguments. The reduceRight method calls the callbackfn function one time for each element in the array.
Calls the specified callback function for all the elements in an array, in descending order. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
A function that accepts up to four arguments. The reduceRight method calls the callbackfn function one time for each element in the array.
If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of an array value.
Calls the specified callback function for all the elements in an array, in descending order. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
Calls the specified callback function for all the elements in an array, in descending order. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
Returns a section of an array.
Optionalstart: numberThe beginning of the specified portion of the array.
Optionalend: numberThe end of the specified portion of the array. This is exclusive of the element at the index 'end'.
Optionalstart: numberOptionalend: numberDetermines whether the specified callback function returns true for any element of an array.
A function that accepts up to three arguments. The some method calls the predicate function for each element in the array until the predicate returns a value which is coercible to the Boolean value true, or until the end of the array.
OptionalthisArg: anyAn object to which the this keyword can refer in the predicate function. If thisArg is omitted, undefined is used as the this value.
OptionalthisArg: anyReturns a string representation of an array. The elements are converted to string using their toLocaleString methods.
Returns a string representation of an array.
Returns an iterable of values in the array
Zh
允许访问模板字面量的原始字符串形式。
En
Allows access to the raw string form of template literals.