使用js获取不到svg标签的宽高
RT：
html代码为：
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg version="1.1" id="one" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
width="601px" height="492px" viewBox="-5.86 4.5 601 492" enable-background="new -5.86 4.5 601 492" xml:space="preserve">
<polygon id="test" onclick="addflag(this)" fill="#FFFCD1" points="491.408,204.173 491.408,204.173 491.185,203.726
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517.185,142.573 517.438,147.009 518.832,148.626 520.199,150.496 521.845,152.587 523.938,154.681 523.938,160.483
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500,195.132 499.304,197.226 498.382,199.988 497.685,202.778 494.199,203.726 "/>
<polygon id="test1" onclick="addflag(this)" fill="#FFFCD1" points="532.334,165.785 532.334,165.785 530.941,164.389
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</svg>
jquery代码为：
alert($('#test').height());//弹出的是0
alert($('#test').innerHeight());//弹出0
都不能取得宽高，不知道怎么才能求出这个svg图形标签的宽高，高手给解答一下。
需要说明的是polygon 标签未设置过任何宽和高的样式或者css
[解决办法]
自己求啊，Xmin, Ymin, Xmax, Ymax
[解决办法]
document.getElementsByTagName("svg")[0].width.animVal.valueAsString;
document.getElementsByTagName("svg")[0].height.animVal.valueAsString;