我是Js的初学者，我正在尝试使用D3.js通过其ID更改特定国家（功能colorCountry）的颜色。但是，无论选择哪种颜色都没关系。结果将始终以橙色突出显示地图。我该怎么做才能解决这个问题？
我的代码如下。
谢谢。
可以在此处下载json文件-https: //gist.githubusercontent.com/d3noob/5193723/raw/6e1434b2c2de24aedde9bcfe35f6a267bd2c04f5/world-110m2.json
<!DOCTYPE html>
<meta charset="utf-8">
<style>
body {
background: #fcfcfa;
}
.stroke {
fill: none;
stroke: #000;
stroke-width: 3px;
}
.fill {
fill: #fff;
}
.graticule {
fill: none;
stroke: #777;
stroke-width: .5px;
stroke-opacity: .5;
}
.land {
fill: #888;
}
.boundary {
fill: none;
stroke: #fff;
stroke-width: .5px;
}
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>
var countryCode = 840; //36: AUSTRALIA * 643: RUSSIA * 76: BRAZIL * 840: USA
var width = 960,
height = 580;
var color = d3.scale.category10();
var projection = d3.geo.mercator()
.scale(170)
.translate([width / 2, height / 2])
.precision(.1);
var path = d3.geo.path()
.projection(projection);
var graticule = d3.geo.graticule();
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
svg.append("defs").append("path")
.datum({type: "Sphere"})
.attr("id", "sphere")
.attr("d", path);
svg.append("use")
.attr("class", "stroke")
.attr("xlink:href", "#sphere");
svg.append("use")
.attr("class", "fill")
.attr("xlink:href", "#sphere");
svg.append("path")
.datum(graticule)
.attr("class", "graticule")
.attr("d", path);
d3.json("world-110m2.json", function(error, world) {
if (error) throw error;
var countries = topojson.feature(world, world.objects.countries).features,
neighbors = topojson.neighbors(world.objects.countries.geometries);
svg.selectAll(".country")
.data(countries)
.enter().insert("path", ".graticule")
.attr("class", "country")
.attr("d", path)
.style("fill", function(d) { if (d.id == countryCode) { return color(colorCountry(d, d.id));} });
svg.insert("path", ".graticule")
.datum(topojson.mesh(world, world.objects.countries, function(a, b) { return a !== b; }))
.attr("class", "boundary")
.attr("d", path);
console.log("value : " + countries[99].id);
console.log("value : " + countries[12].id);
console.log("value : " + countries[108].color);
});
/*HERE*/
function colorCountry(country, countryId) {
if (country.id == countryId) {
return color(country.color = "#FF0000");
}
}
d3.select(self.frameElement).style("height", height + "px");
</script>
我对d3不太熟悉，但是if这一行似乎有太多s：
.style("fill", function(d) { if (d.id == countryCode) { return color(colorCountry(d, d.id));} });
如果您这样做，会更简单：
.style("fill", colorCountry);
并将您的colorCountry功能更改为
function colorCountry(country) {
if (country.id == countryCode) {
return '#FF0000';
} else {
return color(country.id);
}
}
或简单地colorCountry一起摆脱功能，并使用此
.style("fill", function(d) {
return (d.id == countryCode) ? '#FF0000' : color(d.id);
});
但是，为什么不只更新JSON数据呢？
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我来说两句