我正在尝试将数据保存在JSON中并使用fabric.js将其加载回Canvas中我不断收到以下简单代码的错误:canvas.add(newfabric.Rect({width:50,height:50,fill:'red',top:100,left:100}));varc=canvas.toJSON();canvas.clear();canvas.loadFromJSON(c);我得到:SyntaxError:JSON.parse:unexpectedcharacter[BreakOnThisError]varCufon=(function(){vark=function()....I