我看到一些与 Javascript 字符串字面量相关的问题，当编码该值时：
未编码
<!-- Start ValueClick Media 300x250 Code for Test Tag -->
<script language="javascript" src="http://media.fastclick.net/w/get.media?sid=38901&m=6&tp=8&d=j&t=n"></script>
<noscript><a href="http://media.fastclick.net/w/click.here?sid=38901&m=6&c=1" target="_blank">
<img src="http://media.fastclick.net/w/get.media?sid=38901&m=6&tp=8&d=s&c=1"width=300 height=250 border=1></a></noscript>
<!-- End ValueClick Media 300x250 Code for Test Tag -->
I end up with this value:
Decoded
"<!-- Start ValueClick Media 300x250 Code for Test Tag -->\r\n<script language=\"javascript\" src=\"http://media.fastclick.net/w/get.media?sid=38901&m=6&tp=8&d=j&t=n\"></script>\r\n<noscript><a href=\"http://media.fastclick.net/w/click.here?sid=38901&m=6&c=1\" target=\"_blank\">\r\n<img src=\"http://media.fastclick.net/w/get.media?sid=38901&m=6&tp=8&d=s&c=1\"width=300 height=250 border=1></a></noscript>\r\n<!-- End ValueClick Media 300x250 Code for Test Tag -->"
当作为JavaScript代码中的文字量使用时，Firefox会抱怨它没有结束符——但我自己也看不出为什么会这样。
奇怪的是，如果我从上面的HTML中删除"
</script> "关闭标记，编码版本将正确工作，如下所示：
未编码
<!-- Start ValueClick Media 300x250 Code for Test Tag -->
<script language="javascript" src="http://media.fastclick.net/w/get.media?sid=38901&m=6&tp=8&d=j&t=n">
<noscript><a href="http://media.fastclick.net/w/click.here?sid=38901&m=6&c=1" target="_blank">
<img src="http://media.fastclick.net/w/get.media?sid=38901&m=6&tp=8&d=s&c=1"width=300 height=250 border=1></a></noscript>
<!-- End ValueClick Media 300x250 Code for Test Tag -->
编码
"<!-- Start ValueClick Media 300x250 Code for Test Tag -->\r\n<script language=\"javascript\" src=\"http://media.fastclick.net/w/get.media?sid=38901&m=6&tp=8&d=j&t=n\">\r\n<noscript><a href=\"http://media.fastclick.net/w/click.here?sid=38901&m=6&c=1\" target=\"_blank\">\r\n<img src=\"http://media.fastclick.net/w/get.media?sid=38901&m=6&tp=8&d=s&c=1\"width=300 height=250 border=1></a></noscript>\r\n<!-- End ValueClick Media 300x250 Code for Test Tag -->"
这个编码值是有效的...
有人知道我漏掉了什么吗？
更新
现在看起来相当明显，我归咎于缺乏睡眠，在这种情况下，应用程序依赖于旧版本的JSON.Net进行javascript编码 - 因此，我通过引入一个新的字符串JsonConverter来解决了这个问题，在JavaScript转义应用之后，对关闭标签进行第二次处理。
public class EscapeTagsStringConverter : JsonConverter
{
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
if (value == null)
{
writer.WriteNull();
return;
}
string escapedValue = ToEscapedJavaScriptString(value.ToString(), '"').Replace("</", "<\\/");
writer.WriteRawValue("\"" + escapedValue + "\"");
}
public override object ReadJson(JsonReader reader, Type objectType, JsonSerializer serializer)
{
return reader.Value.ToString();
}
public override bool CanConvert(Type objectType)
{
return (objectType == typeof (string));
}
public static char IntToHex(int n)
{
if (n <= 9)
{
return (char)(n + 48);
}
return (char)((n - 10) + 97);
}
public static void WriteCharAsUnicode(TextWriter writer, char c)
{
char h1 = IntToHex((c >> 12) & '\x000f');
char h2 = IntToHex((c >> 8) & '\x000f');
char h3 = IntToHex((c >> 4) & '\x000f');
char h4 = IntToHex(c & '\x000f');
writer.Write('\\');
writer.Write('u');
writer.Write(h1);
writer.Write(h2);
writer.Write(h3);
writer.Write(h4);
}
public static void WriteEscapedJavaScriptChar(TextWriter writer, char c, char delimiter)
{
switch (c)
{
case '\t':
writer.Write(@"\t");
break;
case '\n':
writer.Write(@"\n");
break;
case '\r':
writer.Write(@"\r");
break;
case '\f':
writer.Write(@"\f");
break;
case '\b':
writer.Write(@"\b");
break;
case '\\':
writer.Write(@"\\");
break;
case '\'':
writer.Write((delimiter == '\'') ? @"\'" : @"'");
break;
case '"':
writer.Write((delimiter == '"') ? "\\\"" : @"""");
break;
default:
if (c > '\u001f')
writer.Write(c);
else
WriteCharAsUnicode(writer, c);
break;
}
}
public void WriteEscapedJavaScriptString(TextWriter writer, string value, char delimiter)
{
if (value != null)
{
for (int i = 0; i < value.Length; i++)
{
WriteEscapedJavaScriptChar(writer, value[i], delimiter);
}
}
}
public string ToEscapedJavaScriptString(string value)
{
return ToEscapedJavaScriptString(value, '"');
}
public string ToEscapedJavaScriptString(string value, char delimiter)
{
using (StringWriter w = CreateStringWriter(GetLength(value) ?? 16))
{
WriteEscapedJavaScriptString(w, value, delimiter);
return w.ToString();
}
}
public static StringWriter CreateStringWriter(int capacity)
{
StringBuilder sb = new StringBuilder(capacity);
StringWriter sw = new StringWriter(sb, CultureInfo.InvariantCulture);
return sw;
}
public static int? GetLength(string value)
{
if (value == null)
return null;
return value.Length;
}
}