* Return the first value that is defined. Like MooTools' $.pick.

* Return the first value that is defined. Like MooTools' $.pick.

* 数组或对象遍历 * @memberOf module:zrender/core/util * @param {Object|Array} obj * @param {Function} cb * @param {*} [context]

* 数组或对象遍历 * @memberOf module:zrender/core/util * @param {Object|Array} obj * @param {Function} cb * @param {*} [context]

* 数组或对象遍历 * @memberOf module:zrender/core/util * @param {Object|Array} obj * @param {Function} cb * @param {*} [context]

* 数组或对象遍历 * @memberOf module:zrender/core/util * @param {Object|Array} obj * @param {Function} cb * @param {*} [context]

* Extend an object with the members of another * @param {Object} a The object to be extended * @param {Object} b The object to add to the first one

* Extend an object with the members of another * @param {Object} a The object to be extended * @param {Object} b The object to add to the first one

* Deep merge two or more objects and return a third object. * Previously this function redirected to jQuery.extend(true), but this had two limitation

* Deep merge two or more objects and return a third object. * Previously this function redirected to jQuery.extend(true), but this had two limitation

* Returns true if the object is not null or undefined. Like MooTools' $.defined. * @param {Object} obj

* Returns true if the object is not null or undefined. Like MooTools' $.defined. * @param {Object} obj