Question

尝试使我的JavaScript代码与IE7兼容，并且我遇到了（可能是一个错误）IE7的一些问题。

var elements = url.match(/^:(\d+)(.*)/);

在有效匹配项上返回null：

:80/site1/www
:8080/site2/public_html

不确定如何重写此内容。有什么想法吗？

Answer 1

以下是实施差异：

* Internet Explorer ≤ 8 excludes almost all empty values from the resulting array (e.g., when two delimiters appear next to each other in the data, or when a delimiter appears at the start or end of the data). This behavior differs when using a string as the delimiter.

* Internet Explorer ≤ 8 and older versions of Safari do not splice the values of capturing groups into the returned array.

* In Internet Explorer, captured values for nonparticipating capturing groups are incorrectly returned by RegExp.prototype.exec and String.prototype.match as an empty string rather than undefined, making it impossible to determine group participation.

* Internet Explorer ≤ 8 increments lastIndex after zero-length matches when using RegExp.prototype.exec and RegExp.prototype.test.

* In Internet Explorer, captured values for nonparticipating capturing groups are incorrectly returned by RegExp.prototype.exec and String.prototype.match as an empty string rather than undefined, making it impossible to determine group participation.

使用更简单的RegExp：

var pattern = ":.\\d+/.*";
var data = {"foo":":8080/site2/public_html", "bar":":80/site1/www"};

var elements = (RegExp(pattern).exec(data.foo) + "," + RegExp(pattern).exec(data.bar)).split(",");

使用replaceValue callback替代捕获组以解决浏览器错误。

<强>参考

XRegExp: Browser fixes

IE7中的正则表达式兼容性

1 个答案: