好吧，這裏做一個辦法：http://jsbin.com/isuris/1/edit
對不起，不得不做出太多改變，能夠解釋這一切。看看你能否弄清楚。如果您有問題，請在評論中提問，我會修改答案。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<script type="text/javascript" src="http://mbostock.github.com/d3/d3.js"></script>
<style type="text/css">
.axis path,
.axis line {
fill: none;
stroke: black;
shape-rendering: crispEdges;
}
.axis text {
font-family: sans-serif;
font-size: 11px;
}
.y1 {
fill: white;
stroke: orange;
stroke-width: 1.5px;
}
.y2 {
fill: white;
stroke: red;
stroke-width: 1.5px;
}
.y3 {
fill: white;
stroke: steelblue;
stroke-width: 1.5px;
}
.line {
fill: none;
stroke-width: 1.5px;
}
div.tooltip {
position: absolute;
text-align: center;
width: 50px;
height: 10px;
padding: 5px;
font: 10px sans-serif;
background: whiteSmoke;
border: solid 1px #aaa;
pointer-events: none;
box-shadow: 2px 2px 1px #888;
}
.legend {
padding: 5px;
font: 10px sans-serif;
background: yellow;
box-shadow: 2px 2px 1px #888;
}
.title {
font: 13px sans-serif;
}
</style>
</head>
<body>
<script type="text/javascript">
//Width and height
var w = 500;
var h = 300;
var padding = 50;
var now = d3.time.hour.utc(new Date);
var dataset = [ [ ],[ ] ];
dataset[0].push({x: d3.time.hour.utc.offset(now, -5), y: 0});
dataset[0].push({x: d3.time.hour.utc.offset(now, -4), y: 0});
dataset[0].push({x: d3.time.hour.utc.offset(now, -3), y: 2});
dataset[0].push({x: d3.time.hour.utc.offset(now, -2), y: 0});
dataset[0].push({x: d3.time.hour.utc.offset(now, -1), y: 0});
dataset[0].push({x: now, y: 0});
dataset[1].push({x: d3.time.hour.utc.offset(now, -5), y: 3});
dataset[1].push({x: d3.time.hour.utc.offset(now, -4), y: 1});
dataset[1].push({x: d3.time.hour.utc.offset(now, -3), y: 3});
dataset[1].push({x: d3.time.hour.utc.offset(now, -2), y: 1});
dataset[1].push({x: d3.time.hour.utc.offset(now, -1), y: 5});
dataset[1].push({x: now, y: 1});
var color_hash = { 0 : ["apple", "green"],
1 : ["mango", "orange"],
2 : ["cherry", "red"]
}
// Define axis ranges & scales
var yExtents = d3.extent(d3.merge(dataset), function (d) { return d.y; });
var xExtents = d3.extent(d3.merge(dataset), function (d) { return d.x; });
var xScale = d3.time.scale()
.domain([xExtents[0], xExtents[1]])
.range([padding, w - padding * 2]);
var yScale = d3.scale.linear()
.domain([0, yExtents[1]])
.range([h - padding, padding]);
// Create SVG element
var svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);
// Define lines
var line = d3.svg.line()
.x(function(d) { return x(d.x); })
.y(function(d) { return y(d.y1, d.y2, d.y3); });
var pathContainers = svg.selectAll('g.line')
.data(dataset);
pathContainers.enter().append('g')
.attr('class', 'line')
.attr("style", function(d) {
return "stroke: " + color_hash[dataset.indexOf(d)][1];
});
pathContainers.selectAll('path')
.data(function (d) { return [d]; }) // continues the data from the pathContainer
.enter().append('path')
.attr('d', d3.svg.line()
.x(function (d) { return xScale(d.x); })
.y(function (d) { return yScale(d.y); })
);
// add circles
pathContainers.selectAll('circle')
.data(function (d) { return d; })
.enter().append('circle')
.attr('cx', function (d) { return xScale(d.x); })
.attr('cy', function (d) { return yScale(d.y); })
.attr('r', 3);
//Define X axis
var xAxis = d3.svg.axis()
.scale(xScale)
.orient("bottom")
.ticks(5);
//Define Y axis
var yAxis = d3.svg.axis()
.scale(yScale)
.orient("left")
.ticks(5);
//Add X axis
svg.append("g")
.attr("class", "axis")
.attr("transform", "translate(0," + (h - padding) + ")")
.call(xAxis);
//Add Y axis
svg.append("g")
.attr("class", "axis")
.attr("transform", "translate(" + padding + ",0)")
.call(yAxis);
// Add title
svg.append("svg:text")
.attr("class", "title")
.attr("x", 20)
.attr("y", 20)
.text("Fruit Sold Per Hour");
// add legend
var legend = svg.append("g")
.attr("class", "legend")
.attr("x", w - 65)
.attr("y", 25)
.attr("height", 100)
.attr("width", 100);
legend.selectAll('g').data(dataset)
.enter()
.append('g')
.each(function(d, i) {
var g = d3.select(this);
g.append("rect")
.attr("x", w - 65)
.attr("y", i*25)
.attr("width", 10)
.attr("height", 10)
.style("fill", color_hash[String(i)][1]);
g.append("text")
.attr("x", w - 50)
.attr("y", i * 25 + 8)
.attr("height",30)
.attr("width",100)
.style("fill", color_hash[String(i)][1])
.text(color_hash[String(i)][0]);
});
</script>
</body>
</html>
啊哈，這很合理！一個主要問題是：雖然字體是，.legend的背景和邊框樣式不適用。我假設可以使用其他任何div的相同方式對元素進行樣式設置。這是不正確的？ – darko
@ddarko，這是不正確的。使用CSS（選擇器）設置SVG元素的樣式時，只能使用[SVG屬性]（https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute），而不能使用CSS屬性名稱。正如[本書]（http://chimera.labs.oreilly.com/books/1230000000345/ch03.html#_styling_svg_elements）中所建議的，要區分樣式表中的哪些規則是SVG特定的，您可能需要添加'svg '對這些選擇器：'svg .legend {...}' –