JS not-ended string constant error resolution _javascript tips

1.JAVASCRIPT reference, the character language used is inconsistent.
For example: <script type= "Text/javascript" src= "Xxx.js" charset= "utf-8″>.xxx.js" file is used inside the GB2312 format, the outside call uses the UTF-8, Therefore, some special characters inside the file because of inconsistent format, there are garbled, causing this reason.

2.JAVASCRIPT output HTML characters, the front and back tags do not match.
This is more common, often when the string is output, single quotes (') or double quotes (") are not paired, or when document.write () is not correctly output single quotes (') or double quotes (")

3. HTML markup Language within parameters or include line breaks
What I have come across today is this situation. Because the data I get is passed as a parameter to a function, which contains a newline character, causing this error.
For example: General test only use a single line of data, is normal, does not appear this error.
This error occurs when you use multiple rows of data in a test and use the carriage return chain to wrap. Because it contains a line break.

For the 3rd case, my solution is to not pass the data directly as a parameter, but to first assign it to a hidden text, and the function that needs to be called simply reads the contents of the text.