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JavaScript 中的replace方法，正则或字符串全部交替
作者:Java伴侣 日期:2009-07-08
第一次发现javascript中replace() 方法如果直接用str.replace("-","!") 只会替换第一个匹配的字符.
引用内容
以上是对于交替普通字符串的写法，如果正则表达式，交替方法如下：
因为js不支持类似 /<(?!(a|img))[^>]*(?<!(a|img))>/ 的零宽度正回顾后发断言的正则方式,这题用正则就比较麻烦了
假如需要保留的部分不会被其他标签包含,可以这样:
简单测试通过....不知道实用性如何,没有考虑复杂情况
1.清除HTML格式:
假设原字符串是用\r\n分行,获取的结果以<br />分行,HTML字符串符合XHTML标准
则有: str.replace(/<[^>]*>/g, "").replace(/\r\n/g, "<br />");
试运行:
<script language="javascript" type="text/javascript">
var str = "<li><a href025616163715.shtml TARGET=_blank>职称不再要求</a><FONT style=\"FONT-SIZE:12px\"> (8月24日)</FONT>\r\n" +
"<li><a href=025616163704.shtml TARGET=_blank>火公园今日将提前限客</a><FONT style=\"FONT-SIZE:12px\"> (8月24日)</FONT>";
document.write(str.replace(/<[^>]*>/g, "").replace(/\r\n/g, "<br />"));
</script>
2.清除font
前提,字符串符合XHTML标准(即元素闭合正常)
str.replace(/<font .*?<\/font>/ig,"");
引用内容replace()
The replace() method returns the string that results when you replace text matching its first argument
(a regular expression) with the text of the second argument (a string).
If the g (global) flag is not set in the regular expression declaration, this method replaces only the first
occurrence of the pattern. For example,
var s = "Hello. Regexps are fun.";s = s.replace(/\./, "!"); // replace first period with an exclamation pointalert(s);
produces the string “Hello! Regexps are fun.” Including the g flag will cause the interpreter to
perform a global replace, finding and replacing every matching substring. For example,
var s = "Hello. Regexps are fun.";s = s.replace(/\./g, "!"); // replace all periods with exclamation pointsalert(s);
yields this result: “Hello! Regexps are fun!”
The replace() method returns the string that results when you replace text matching its first argument
(a regular expression) with the text of the second argument (a string).
If the g (global) flag is not set in the regular expression declaration, this method replaces only the first
occurrence of the pattern. For example,
var s = "Hello. Regexps are fun.";s = s.replace(/\./, "!"); // replace first period with an exclamation pointalert(s);
produces the string “Hello! Regexps are fun.” Including the g flag will cause the interpreter to
perform a global replace, finding and replacing every matching substring. For example,
var s = "Hello. Regexps are fun.";s = s.replace(/\./g, "!"); // replace all periods with exclamation pointsalert(s);
yields this result: “Hello! Regexps are fun!”
以上是对于交替普通字符串的写法，如果正则表达式，交替方法如下：
因为js不支持类似 /<(?!(a|img))[^>]*(?<!(a|img))>/ 的零宽度正回顾后发断言的正则方式,这题用正则就比较麻烦了
假如需要保留的部分不会被其他标签包含,可以这样:
复制内容到剪贴板
程序代码
程序代码str.replace(/<font .*?<\/font>/ig,"").
replace(/<script .*?<\/script>/ig,"").
replace(/<(a|img)/ig, "@@@$1").
replace(/<[^>a]*>/ig, "").
replace(/@@@(a|img)/ig, "<$1");
replace(/<script .*?<\/script>/ig,"").
replace(/<(a|img)/ig, "@@@$1").
replace(/<[^>a]*>/ig, "").
replace(/@@@(a|img)/ig, "<$1");
简单测试通过....不知道实用性如何,没有考虑复杂情况
1.清除HTML格式:
假设原字符串是用\r\n分行,获取的结果以<br />分行,HTML字符串符合XHTML标准
则有: str.replace(/<[^>]*>/g, "").replace(/\r\n/g, "<br />");
试运行:
<script language="javascript" type="text/javascript">
var str = "<li><a href025616163715.shtml TARGET=_blank>职称不再要求</a><FONT style=\"FONT-SIZE:12px\"> (8月24日)</FONT>\r\n" +
"<li><a href=025616163704.shtml TARGET=_blank>火公园今日将提前限客</a><FONT style=\"FONT-SIZE:12px\"> (8月24日)</FONT>";
document.write(str.replace(/<[^>]*>/g, "").replace(/\r\n/g, "<br />"));
</script>
2.清除font
前提,字符串符合XHTML标准(即元素闭合正常)
str.replace(/<font .*?<\/font>/ig,"");
[本日志由 blurxx 于 2009-07-08 01:52 PM 编辑]
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Tags: JS replace all 正则 
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