function rtrim(char:String):String{if(char == null){return null;}var pattern:RegExp = /\s$/; return char.replace(pattern,"");}/\s$/;这是干什么的?

来源：学生作业帮助网编辑：作业帮时间：2024/07/13 11:17:06

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function rtrim(char:String):String{if(char == null){return null;}var pattern:RegExp = /\s*$/; return char.replace(pattern,"");}/\s*$/;这是干什么的?

function rtrim(char:String):String{if(char == null){return null;}var pattern:RegExp = /\s$/; return char.replace(pattern,"");}/\s$/;这是干什么的?