My page is a JSP page, which contains a parameter: lefttree,

This lefttree is spelled out from the background, the content is HTML code: such as:

<div class="test" onclick="show('tt1','abc')">

In the JSP page, you need to pass the value to a div through the js code, as follows:

<script type="text/javascript">
window.parent.document.getElementById('mptree').innerHTML='<%=lefttree%>';
<script>

In this way, because lefttree contains both single and double quotation marks, there is an error in matching with the outermost single quotation mark in js, and it becomes:

'<div class="test" onclick="show('tt1','abc')">'

Solutions:

Escape character ”/”

When splicing lefttree in the background, it becomes the following form:

<div class="test" onclick="show(///'tt1///',///'abc///')">

Among them:

The first two ”//” s are used to leave a ”/” in the page

The third ”/” escapes the single quote after it.

In this way, the value of lefttree is:

<div class="test" onclick="show(/'tt1/',/'abc/')">