Javascript 在Json调用中使用变量值

这是我的json信息

{"RAW":<br>
&nbsp;&nbsp;&nbsp;{"CAN":<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{"AUD":     {"FROMSYMBOL":"CAN","BUY":"0.317993","SELL":"0.31012","MARKETCAP":"12,787,119","CHANGE":"2.13%"}}

"RISE":
    {"AUD":
        {"FROMSYMBOL":"RISE","BUY":"0.337224","SELL":"0.331142","MARKETCAP":"13,396,190","CHANGE":"0.00%"}}

"SAFEX":
<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{"AUD":
{"FROMSYMBOL":"SAFEX","BUY":"0.013389","SELL":"0.013389","MARKETCAP":"29,777,352","CHANGE":"0.00%"}}

"HST":
<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{"AUD":{"FROMSYMBOL":"HST","BUY":"1.00726","SELL":"0.980698","MARKETCAP":"30,587,338","CHANGE":"9.66%"}}

"HAV":<br>&nbsp;&nbsp;{"AUD":
<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{"FROMSYMBOL":"HAV","BUY":"0.601209","SELL":"0.495748","MARKETCAP":"32,375,759","CHANGE":"3.38%"}}

我不想为每个页面创建特定的页面

我能做的就是提取一个特定的变量值，例如

 var foo = "SAFEX";

我想能够做的是像这样将该值插入到json调用中

 document.getElementById("foo-PRICE").innerHTML = jsonObj.RAW.foo.AUD.BUY;

我已经尝试了所有我能想到的方法，不管我怎么切碎它，eval（）似乎都一事无成

如有任何建议，将不胜感激

document.getElementById(foo +"-PRICE").innerHTML = jsonObj.RAW[foo].AUD.BUY;

document.getElementById(foo +"-PRICE").innerHTML = jsonObj.RAW[foo].AUD.BUY;