TypedArrays 不是一个典型的 数组类型，所以不存在 splice 方法。但是可以模拟实现

function splice(arr, starting, deleteCount, elements) {  if (arguments.length === 1) {    return arr;  }  starting = Math.max(starting, 0);  deleteCount = Math.max(deleteCount, 0);  elements = elements || [];  const newSize = arr.length - deleteCount + elements.length;  const splicedArray = new arr.constructor(newSize);  splicedArray.set(arr.subarray(0, starting));  splicedArray.set(elements, starting);  splicedArray.set(arr.subarray(starting + deleteCount), starting + elements.length);  return splicedArray;};