利用d3更改坐标的显示方式

var data = [{            "creat_time": "2013-03-12 15:09:04",            "record_status": "ok",            "roundTripTime": "16"        }, {            "creat_time": "2013-03-12 14:59:06",            "record_status": "ok",            "roundTripTime": "0"        }, {            "creat_time": "2013-03-12 14:49:04",            "record_status": "ok",            "roundTripTime": "297"        }, {            "creat_time": "2013-03-12 14:39:06",            "record_status": "ok",            "roundTripTime": "31"        },{            "creat_time": "2013-03-12 14:29:03",            "record_status": "ok",            "roundTripTime": "0"    }];    var margin = {top: 20, right: 20, bottom: 30, left: 50};    var width = 960 - margin.left - margin.right;    var height = 500 - margin.top - margin.bottom;    var parseDate = d3.time.format("%Y-%m-%d %H:%M:%S").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");    var yAxis = d3.svg.axis()        .scale(y)        .orient("left");    var line = d3.svg.line()        .x(function(d) { return x(d.creat_time); })        .y(function(d) { return y(d.roundTripTime); });    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 + ")");    data.forEach(function(d) {        d.creat_time = parseDate(d.creat_time);        d.roundTripTime = +d.roundTripTime;    });    x.domain(d3.extent(data, function(d) { return d.creat_time; }));    y.domain(d3.extent(data, function(d) { return d.roundTripTime;}));    svg.append("g")          .attr("class", "x axis")          .attr("transform", "translate(0," + height + ")")          .call(xAxis);    svg.append("g")          .attr("class", "y axis")          .call(yAxis)          .append("text")          .attr("transform", "rotate(-90)")          .attr("y", 6)          .attr("dy", ".71em")          .style("text-anchor", "end")          .text("return time(ms)");    svg.append("path")          .datum(data)          .attr("class", "line")          .attr("d", line);

}

更改横坐标的时间格式：

var xAxis = d3.svg.axis()    .scale(x)    .orient("bottom")    .tickFormat(d3.time.format("%H"));