node.js数据类型检查

export function isString(arg) { return arg && typeof(arg) == "string"; }
export function isNumber(arg) { return arg && typeof(arg) == "number" && !isNaN(arg); }
export function isBoolean(arg) { return arg === !!arg; }
export function isArray(arg) { return Object.prototype.toString.call(arg) == '[object Array]'; }
export function isObject(arg) { return Object.prototype.toString.call(arg) == '[object Object]'; }
export function isFunction(arg) { return Object.prototype.toString.call(arg) == '[object Function]'; }
export function isEmpty(arg) { return Object.keys(arg).length === 0; }

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