@icanvas/webpack/utils/attr.js

这是icanvas的默认webpack打包配置

module.exports = function(object) {
	var has = object;
	for (let i = 1; i < arguments.length; i++) {
		if (has === null || typeof has != 'object') return;
		has = has[arguments[i]];
	}
	return has;
};