function inArray(arr, key, val) {
	if (!arr || !arr.length || typeof arr != 'object' || !Array.isArray(arr)) {
		return -1
	}
	for (let i = 0; i < arr.length; i++) {
		if (!key) {
			if (arr[i] == val) {
				return i
			}
		} else if (arr[i][key] === val) {
			return i
		}
	}
	return -1;
}

// ArrayBuffer转16进度字符串示例
function ab2hex(buffer, split) {
	var hexArr = Array.prototype.map.call(
		new Uint8Array(buffer),
		function(bit) {
			return ('00' + bit.toString(16)).slice(-2)
		}
	)
	return hexArr.join(split);
}
module.exports = {
	inArray,
	ab2hex,
}