/** * Get the number of formal parameters of the function* @param {Function} func [Function to be obtained] * @return {*} [Array of formal parameters or undefined] */function getFuncParameters(func) { if (typeof func == 'function') { var mathes = /[^(]+/(([^)]*)?/)/gm.exec(Function.prototype.toString.call(func)); if (mathes[1]) { var args = mathes[1].replace(/[^,/w]*/g, '').split(','); return args; } }}