设置窗口的宽度（以像素为单位）。最小值为250，指定浏览器内容区域的最小宽度。
Sets the width of the window in pixels. The minimum value is 250, and specifies the minimum width of the browsers content area.
最小价格变化单位是买卖价差的底线，设置过高会人为地提高买卖价差的水平，增加交易费用；
Tick size is the bottom line of price spreads, the subtleness of which great affects the prices and market efficiency.
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