I have seen everyone doing it tho i dont' get why.
document.write('<script src="src"><\/script>'); I mean using the single ' you shouldn't need to esacape chars?
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问题:
回答1:
- Single and double quoted strings have the same escaping rules.
- It prevents
</script>from being parsed as an closing tag.
"</script> and "<\/script>" are the same to JavaScript, but only the first one is interpreted by the HTML parser to contain a HTML closing tag.
回答2:
</script> always ends a script block - no matter what (e.g. HTML comments or CDATA) you do. So it must never occur in a script block unless you actually want to end the block and the easiest way to do so is escaping forward slashes (the escaping doesn't do anything; in JavaScript unknown escape sequences just "lose" their backslash).
回答3:
The HTML-parser will see the </script> in your string as a closing tag and close your initial <script>. It does not have the concept of strings.
So your piece of JavaScript will only be seen as document.write('<script src="src"> if you dont escape it and the rest, '); will be seen as a HTML text-node.
Also, note that you don't have to "escape" the </script> in a particular way. As long as you don't write it exactly like </script>, anything is ok. Some examples that all work:
document.write('<script src="src"><\/script>'); document.write('<script src="src"></scr' + 'ipt>'); document.write('<script src="src"></' + 'script>'); 回答4:
It's for an XHTML validity. You can use a validator for see that : http://validator.w3.org/. You can use a also use CDATA tag. See this similar question for more details : Escaping HTML in jQuery so it's valid