如何使用 d3 的 time.format 格式化日期

Question

此 JSFiddle 和下面的代码段使用以下格式：

"%d-%b-%y"

对于这样的日期：

"1-May-12"

var margin = {
    top: 30,
    right: 20,
    bottom: 30,
    left: 50
};
var width = 600 - margin.left - margin.right;
var height = 270 - margin.top - margin.bottom;

var parseDate = d3.time.format("%d-%b-%y").parse;

var x = d3.time.scale().range([0, width]);
var y = d3.scale.linear().range([height, 0]);

var xAxis = d3.svg.axis().scale(x)
    .orient("bottom").ticks(5);

var yAxis = d3.svg.axis().scale(y)
    .orient("left").ticks(5);

var valueline = d3.svg.line()
    .x(function (d) {
      return x(d.date);
    })
    .y(function (d) {
      return y(d.close);
    });

var svg = d3.select("body")
    .append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
    .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

// Get the data
var data = [{
    date: "1-May-12",
    close: "58.13"
}, {
    date: "30-Apr-12",
    close: "53.98"
}, {
    date: "27-Apr-12",
    close: "67.00"
}, {
    date: "26-Apr-12",
    close: "89.70"
}, {
    date: "25-Apr-12",
    close: "99.00"
}];

data.forEach(function (d) {
    d.date = parseDate(d.date);
    d.close = +d.close;
});

// Scale the range of the data
x.domain(d3.extent(data, function (d) {
    return d.date;
    }));
y.domain([0, d3.max(data, function (d) {
    return d.close;
    })]);

svg.append("path") // Add the valueline path.
.attr("d", valueline(data));

svg.append("g") // Add the X Axis
.attr("class", "x axis")
    .attr("transform", "translate(0," + height + ")")
    .call(xAxis);

svg.append("g") // Add the Y Axis
.attr("class", "y axis")
    .call(yAxis);

body {
    font: 12px Arial;
}
path {
    stroke: steelblue;
    stroke-width: 2;
    fill: none;
}
.axis path, .axis line {
    fill: none;
    stroke: grey;
    stroke-width: 1;
    shape-rendering: crispEdges;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>

我的约会对象是这样的：

"24/02/2015"

所以我认为这样的格式可行：

"%d/%m/%y"

但事实并非如此；它 returns 无效。我应该使用什么？

Answer 1

是你想要的吗？

var margin = {
    top: 30,
    right: 20,
    bottom: 30,
    left: 50
};
var width = 600 - margin.left - margin.right;
var height = 270 - margin.top - margin.bottom;

var parseDate = d3.time.format("%d-%m-%y").parse;

var x = d3.time.scale().range([0, width]);
var y = d3.scale.linear().range([height, 0]);

var xAxis = d3.svg.axis().scale(x)
    .orient("bottom").ticks(5);

var yAxis = d3.svg.axis().scale(y)
    .orient("left").ticks(5);

var valueline = d3.svg.line()
    .x(function (d) {
      return x(d.date);
    })
    .y(function (d) {
      return y(d.close);
    });

var svg = d3.select("body")
    .append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
    .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

// Get the data
var data = [{
    date: "1-1-12",
    close: "58.13"
}, {
    date: "30-2-12",
    close: "53.98"
}, {
    date: "27-3-12",
    close: "67.00"
}, {
    date: "26-4-12",
    close: "89.70"
}, {
    date: "25-5-12",
    close: "99.00"
}];

data.forEach(function (d) {
    d.date = parseDate(d.date);
    d.close = +d.close;
});

// Scale the range of the data
x.domain(d3.extent(data, function (d) {
    return d.date;
    }));
y.domain([0, d3.max(data, function (d) {
    return d.close;
    })]);

svg.append("path") // Add the valueline path.
.attr("d", valueline(data));

svg.append("g") // Add the X Axis
.attr("class", "x axis")
    .attr("transform", "translate(0," + height + ")")
    .call(xAxis);

svg.append("g") // Add the Y Axis
.attr("class", "y axis")
    .call(yAxis);

body {
    font: 12px Arial;
}
path {
    stroke: steelblue;
    stroke-width: 2;
    fill: none;
}
.axis path, .axis line {
    fill: none;
    stroke: grey;
    stroke-width: 1;
    shape-rendering: crispEdges;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<script src="http://d3js.org/d3.v3.min.js"></script>
<body></body>

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