What is the Impact of Closing Script Tags within String Quotations in JavaScript?

Script Tag in JavaScript String: A Common Pitfall

Many developers encounter an unexpected behavior in JavaScript when a closing script tag "" appears within a quoted string. This can result in the script being prematurely terminated.

The crux of the issue lies in the browser's HTML parser. When encountering the closing script tag inside the string, it misinterprets it as the end of the script element.

Consider the following syntax-colored example:

<code class="js"><script>
var test = 'foo... </script> bar.....';
</script></code>

Notice how "bar" is treated as text content outside the script element, causing the script to end abruptly.

To resolve this issue, it is common practice to use string concatenation, as seen below:

<code class="js">var test = '...... </scr' + 'ipt>......';</code>

By breaking up the closing script tag into its component parts, the browser correctly parses the string without confusing it with the end of the script element. This ensures that the script continues to execute as intended.

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