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因为char的长度是500，文字有点多，所以都显示在列表内，会把旁边的都挤到一块儿去，样式会很难看。要怎么设定显示的长度啊？？ 请指教。。
http://git.oschina.net/osbzr/openerp-china/tree/master/openerp/addons/osbzr_draggable可以拖动改宽度
写一个函数字段，想显示多少就显示多少。
