去除(多余空格) 用一个空格或一个给定字符替换所有重复空格,换行和制表符. 例子： articleTitle：`Grandmother of\neight makes\t hole in one.` 模板： ``` _{$articleTitle}_ _{$articleTitle|strip}_ _{$articleTitle|strip:" "}_ ``` 输出： ``` Grandmother of eight makes hole in one. Grandmother of eight makes hole in one. Grandmother of eight makes hole in one. ```