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var ctx = canvas.getContext("2d");
var data = "<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'>" +
"<foreignObject width='100%' height='100%'>" +
"<div xmlns='http://www.w3.org/1999/xhtml' style='font-size:40px;color:red'>" +
"<em>I</em> like <span style='color:white; text-shadow:0 0 2px blue;'>网络的上面</span>" +
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