问题
So I am trying to generate a lower case sigma using a HTML code similar to
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>MathJax example</title>
<script type="text/javascript" async src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/latest.js?config=TeX-MML-AM_CHTML" async>
</script>
</head>
<body>
<p id="This_Is_What_I_Want"> $$ \sigma^2 $$</p>
<p id="Output"></p>
<p id="Activate"><button onclick="RUN()">Test This out</button></p>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js?config=TeX-AMS_HTML,http://myserver.com/MathJax/config/local/local.js">
function RUN() {
document.getElementById("Output").innerHTML = "$$ \sigma^2 $$";
MathJax.Hub.Queue(["Typeset", MathJax.Hub]);
}
</script>
</body>
The first sigma loads correctly but when I hit the button the second one will not load correctly
WHY!
回答1:
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>MathJax example</title>
<script type="text/javascript" async src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/latest.js?config=TeX-MML-AM_CHTML" async>
</script>
</head>
<body>
<p id="This_Is_What_I_Want"> $$ \sigma^2 $$</p>
<p id="Output"></p>
<p id="Activate"><button onclick="RUN()">Test This out</button></p>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js?config=TeX-AMS_HTML,http://myserver.com/MathJax/config/local/local.js">
function RUN() {
document.getElementById("Output").innerHTML = "$$ \\sigma^2 $$";
MathJax.Hub.Queue(["Typeset", MathJax.Hub]);
}
</script>
</body>
apparently I did not read instructions on the documentation but the default is you need two \ as opposed to one
来源：https://stackoverflow.com/questions/53369175/issue-generating-a-sigma-using-mathjax-1-success-and-1-fail