This is particularly useful when small differences have to be investigated ( for example, is the trailing white space part of the annotation?). 在必须研究细微的差异时(例如,注释的末尾是否有空格),这个特性尤其有用。
Using normalize-space() sets this right: It removes leading and trailing white space and turns all other sequences of white space into a single space. 使用normalize-space()可将此设置正确:它将删除开头和结尾处的空格,并将所有其他空格序列转为单独一个空格。
Any of various trailing or twining, often weedy plants of the genera Calystegia and Convolvulus, having white, pink, or purple bell-shaped or funnel-shaped flowers. You ( or One) cannot make a silk purse out of a sow's ear 旋花一种蔓生或缠绕的打碗花属和旋花属的蔓延植物,开白色、粉色或紫色钟状或漏斗形的花
An aeroplane flew across the sky trailing white vapor. 一架飞机从空中飞过,尾部拖着一条水汽形成的白线。
Mostly trailing cacti having nocturnal white flowers; tropical America and Caribbean region. 一个主要为蔓延的仙人掌属,夜间开白花;产于热带美洲和加勒比海地区。
Any leading or trailing white space characters will be removed from each field, element or attribute. 任何前导或后继的空格字符将会从每个字段、元素和属性中删除。