档案日期2014的45

One of my favorite syntactic sugar methods available in Rails is the Object.blank?, which evaluates to true if the given object is false, empty, or a whitespace string. It makes your conditional expressions more readable; avoiding the use of ...

百度ECharts是一款由百度前端团队开发与维护的，基于HTML5的开源JavaScript图表库。E是Enterprise的简称，意思是商业级数据图表。

本文简述使用ECharts绘制饼图(Pie Chart)的过程，下图为使用ECharts绘制的饼图实例。

题目描述：

Design a stack that supports push, pop, top, and retrieving the minimum element in constant time.

• push(x) -- Push element x onto stack.
• pop() -- Removes the element on top of the stack.
• top() -- Get the top element.
• getMin() -- Retrieve ...