RegExp.输入($_)
Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
注意:所有全局公开最后匹配状态的
RegExp
静态属性均已弃用。请参阅 已弃用的 RegExp 功能 了解更多信息。¥Note: All
RegExp
static properties that expose the last match state globally are deprecated. See deprecated RegExp features for more information.
RegExp.input
静态访问器属性返回与正则表达式匹配的字符串。RegExp.$_
是该属性的别名。
¥The RegExp.input
static accessor property returns the string against which a regular expression is matched. RegExp.$_
is an alias for this property.
描述
¥Description
由于 input
是 RegExp
的静态属性,因此你始终将其用作 RegExp.input
或 RegExp.$_
,而不是用作你创建的 RegExp
对象的属性。
¥Because input
is a static property of RegExp
, you always use it as RegExp.input
or RegExp.$_
, rather than as a property of a RegExp
object you created.
每当 RegExp
(但不是 RegExp
子类)实例成功匹配时,input
的值就会更新。如果没有匹配,则 input
为空字符串。你可以设置 input
的值,但这不会影响正则表达式的其他行为,并且在下一次成功匹配时该值将再次被覆盖。
¥The value of input
updates whenever a RegExp
(but not a RegExp
subclass) instance makes a successful match. If no matches have been made, input
is an empty string. You can set the value of input
, but this does not affect other behaviors of the regex, and the value will be overwritten again when the next successful match is made.
示例
使用输入和 $_
规范
Specification |
---|
Legacy RegExp features # additional-properties-of-the-regexp-constructor |
浏览器兼容性
BCD tables only load in the browser