MathJax的使用

 <script type="text/x-mathjax-config">
            MathJax.Hub.Config({
              showProcessingMessages: false,
              tex2jax: { inlineMath: [['$','$'],['\\(','\\)']] }
            });
  $(function() {
   var content = "";
      var Preview = {
    		  delay: 150,        

    		  preview: null,    
    		  buffer: null,      

    		  timeout: null,     
    		  mjRunning: false,  
    		  mjPending: false,  
    		  oldText: null,    


    		  Init: function () {
    		    this.preview = document.getElementById("MathPreview");
    		    this.buffer = document.getElementById("MathBuffer");
    		  },


    		  SwapBuffers: function () {
    		    var buffer = this.preview, preview = this.buffer;
    		    this.buffer = buffer; this.preview = preview;
    		    buffer.style.visibility = "hidden"; buffer.style.position = "absolute";
    		    preview.style.position = ""; preview.style.visibility = "";
    		  },


    		  Update: function () {
    		    if (this.timeout) {clearTimeout(this.timeout)}
    		    this.timeout = setTimeout(this.callback,this.delay);
    		  },
    		 
    		  CreatePreview: function () {
    		    Preview.timeout = null;
    		    if (this.mjPending) return;
    		    var text = content;
    		    if (text === this.oldtext) return;
    		    if (this.mjRunning) {
    		      this.mjPending = true;
    		      MathJax.Hub.Queue(["CreatePreview",this]);
    		    } else {
    		      this.buffer.innerHTML = this.oldtext = text;
    		      this.mjRunning = true;
    		      MathJax.Hub.Queue(
    			["Typeset",MathJax.Hub,this.buffer],
    			["PreviewDone",this]
    		      );
    		    }
    		  },


    		  PreviewDone: function () {
    		    this.mjRunning = this.mjPending = false;
    		    this.SwapBuffers();
    		  }

    		};


    		Preview.callback = MathJax.Callback(["CreatePreview",Preview]);
    		Preview.callback.autoReset = true;  
  	
  	Preview.Init();
  	
  	$("#uptitle,#upcontent,#upanswerTitle,#upanswerContent").on("input", function() {
  		content = $(this).val();
  		Preview.Update();
  	});
  });
 </script>
 <script type="text/javascript" src="${pageContext.request.contextPath}/js/mathjax/MathJax.js?config=TeX-MML-AM_HTMLorMML"></script>
 
 <div class="form-group">
     <label for="upanswerTitle"  class="control-label" style="text-align: center;width:20%">答案<span style="color:red;"> *</span></label>
     <textarea id="upanswerTitle" class="form-control"
		style="width: 70%; display: inline-block; margin-right: 15px; padding-left:0px; padding-right:0px;" rows="5" cols=""></textarea>
						           
 </div>
 <div class="form-group">
     <label for="upanswerContent" class="control-label" style="text-align: center;width:20%">解析</label>
     <textarea id="upanswerContent" class="form-control"
		style="width: 70%; display: inline-block; margin-right: 15px; padding-left:0px; padding-right:0px;"
		 rows="5" cols=""></textarea>
 </div>
                            
  <div class="form-group">
	<div id="MathPreview" style="padding: 3px; width:100%; margin-top:5px"></div>
	<div id="MathBuffer" style="border:1px solid; padding: 3px; width:100%; margin-top:5px; 
	      visibility:hidden; position:absolute; top:0; left: 0"></div>
   </div>