module.exports = extend
var hasOwnProperty = Object.prototype.hasOwnProperty;
function extend() {
    var target = {}
    for (var i = 0; i < arguments.length; i++) {
        var source = arguments[i]
        for (var key in source) {
            if (hasOwnProperty.call(source, key)) {
                target[key] = source[key]
            }
        }
    }
    return target
}