我有点卡住了，我创建了一个D3应用程序，它从数据库中检索一堆传感器信息。我已经做到这一点，它转换并运行30秒循环来更新信息。它解析Javascript对象并在图形上为每个传感器绘制一条线。一切似乎进展顺利，但在应用程序中的几个小时将停止并停止更新。然后它抱怨脚本没有响应。这是情节的JS：
var thresholdTemp = 72;
var minutes = 5;
var transInterval;
//Main function to create a graph plot
function plot(date1, date2, interval) {
var data;
//If we define a date search parameter then we don't want to have it load interactive
if (date1 == undefined && date2==undefined) {
data = loadMinutesJSON(minutes);
} else {
data = searchJSON(date1, date2, interval);
}
var margin = {top: 20, right: 80, bottom: 60, left: 50},
width = 960 - margin.left - margin.right ,
height = 500 - margin.top - margin.bottom;
//Re-order the data to be more usable by the rest of the script
var parseDate = d3.time.format("%Y-%m-%d %H:%M:%S").parse;
//Convert the JSON to be better usable by D3
data = convertJSON(data);
//Nest the data so that it's grouped by serial number
data = d3.nest().key(function(d) { return d.serial; }).entries(data);
//Set the X domain to exist within the date and times given
var x = d3.time.scale().domain([getMinDate(data), getMaxDate(data)]).range([0, (width)]);
//Y Axis scale set to start at 45 degrees and go up to 30 degrees over highest temp
var y = d3.scale.linear()
.domain([
45,
getMaxTemp(data) + 10
])
.range([height, 0]);
//Set up the line colors based on serial number, this generates a color based on an ordinal value
var color = d3.scale.category20()
.domain(d3.keys(data[0]).filter(function(key) { return key === 'serial';}));
//Define where the X axis is
var xAxis = d3.svg.axis()
.scale(x)
.orient("bottom")
.tickFormat(d3.time.format("%b %d %H:%M:%S"));
//Define where the Y axis is
var yAxis = d3.svg.axis()
.scale(y)
.orient("left");
//When called creates a line with the given datapoints
var line = d3.svg.line()
.interpolate("basis")
.x(function(d) { return x(d.date); })
y(function(d) { return y(d.reading); });
//An extra line to define a maximum temperature threshold
var threshold = d3.svg.line()
.x(function(d) { return x(d.date);})
.y(function(d) { return y(thresholdTemp); });
//Append the SVG to the HTML element
var svg = d3.select("#plot").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 + ")");
//Define the clipping boundaries
svg.append("defs").append("clipPath")
.attr("id", "clip")
.append("rect")
.attr("width", (width + margin.left + margin.right))
.attr("height", height + margin.top + margin.bottom);
//Add the X axis
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis)
.selectAll("text")
.style("text-anchor", "end")
.attr("dx", "-.8em")
.attr("dy", ".15em")
.attr("transform" , function (d) {return "rotate(-35)"});
//Add the Y axis and a label denoting it as temperature in F
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("Temperature (F)");
//Create the lines based on serial number
var serial = svg.selectAll(".serial")
.data(data, function(d) { return d.key;})
.enter().append("g")
.attr("class", "serial");
//Add the extra line for a threshold and align it with the current time
var threshElement = svg.selectAll(".thresh")
.data(data, function(d) { return d.key;})
.enter().append("g")
.attr("class", ".thresh");
//Add the path to draw lines and clipping so they stay within bounds
var path = serial.append("path")
.attr("clip-path", "url(#clip)")
.attr("class", "line")
.attr("d", function (d) {return line(d.values);})
.style("stroke", function(d) {return color(d.key);});
//Custom path to add a line showing the temperature threshold
var threshpath = threshElement.append("path")
.attr("class", "line")
.attr("d", function(d) { return threshold(d.values);})
.style("stroke", "red");
//Add a label to the end of the threshold line denoting it as the threshold
threshElement.append("text")
.attr("transform", "translate(" + x(getMaxDate(data)) + "," + y(thresholdTemp + .5) + ")")
.attr("x", 3)
.attr("dy", ".35em")
.text("Threshold");
//Add the legend
plotLegend(data);
//Load in the new data and add it to the SVG
function transition() {
var newdata = loadMinutesJSON(minutes);
newdata = convertJSON(newdata);
console.log(newdata.length);
newdata = d3.nest().key(function(d) { return d.serial; }).entries(newdata);
if (data[0]["values"][0]["date"].toString() === newdata[0]["values"][0]["date"].toString()) { console.log("No New Data");return;}
//Merge the new data with the old and remove duplicates
data = merge(data,newdata);
//Chop off the preceding data that is no longer needed or visible
data = reduce(data, minutes);
x.domain([getMinDate(data), getMaxDate(data)]);
y.domain([45, getMaxTemp(data) + 10]);
d3.select(".x.axis")
.transition()
.duration(500).call(xAxis)
.selectAll("text")
.style("text-anchor", "end")
.attr("dx", "-.8em")
.attr("dy", ".15em")
.attr("transform" , function (d) {return "rotate(-35)"});
d3.select(".y.axis").transition().duration(500).call(yAxis);
var serial2 = svg.selectAll(".serial")
.data(data, function(d) { return d.key;});
serial2.enter().append("g").attr("class", "line");
var threshold2 = svg.selectAll(".thresh")
.data(data, function(d) { return d.key;});
threshold2.enter().append("g").attr("class", "line");
threshpath
.attr("d", function(d) {return threshold(d.values);})
.attr("transform", null)
.transition()
.duration(500)
.ease("linear");
threshElement.selectAll("text")
.attr("transform", "translate(" + x(getMaxDate(data)) + "," + y(thresholdTemp + .5 ) + ")")
.attr("x", 3)
.transition()
.duration(500)
.ease("linear");
path
.attr("d", function(d) { return line(d.values);})
.attr("transform", null)
.transition()
.duration(500)
.ease("linear");
//.attr("transform", "translate(" + x(0) + ")");
console.log(svg);
serial2.exit().remove();
threshold2.exit().remove();
//Remove the old, unused data
//data = reduce(data, minutes);
}
if(date1 == undefined && date2 == undefined) {
//Set the transition loop to run every 30 seconds
transInterval = setInterval(transition,30000);
}
}
以下是数据结构的示例：
[{"serial":"2D0008017075F210","date":"2013-08-23T14:35:19.000Z","reading":76.1,"elevation":null,"room":null,"system":null},{"serial":"2D0008017075F210","date":"2013-08-23T14:35:50.000Z","reading":76.1,"elevation":null,"room":null,"system":null},{"serial":"2D0008017075F210","date":"2013-08-23T14:36:20.000Z","reading":76.1,"elevation":null,"room":null,"system":null},{"serial":"2D0008017075F210","date":"2013-08-23T14:36:50.000Z","reading":76.1,"elevation":null,"room":null,"system":null},{"serial":"2D0008017075F210","date":"2013-08-23T14:37:20.000Z","reading":76.1,"elevation":null,"room":null,"system":null},{"serial":"2D0008017075F210","date":"2013-08-23T14:37:50.000Z","reading":76.1,"elevation":null,"room":null,"system":null},{"serial":"2D0008017075F210","date":"2013-08-23T14:38:20.000Z","reading":76.1,"elevation":null,"room":null,"system":null},{"serial":"2D0008017075F210","date":"2013-08-23T14:38:50.000Z","reading":76.1,"elevation":null,"room":null,"system":null},{"serial":"2D0008017075F210","date":"2013-08-23T14:39:20.000Z","reading":76.1,"elevation":null,"room":null,"system":null},{"serial":"2D0008017075F210","date":"2013-08-23T14:39:50.000Z","reading":76.1,"elevation":null,"room":null,"system":null},{"serial":"1D00080170496D10","date":"2013-08-23T14:35:19.000Z","reading":73.4,"elevation":null,"room":null,"system":null},{"serial":"1D00080170496D10","date":"2013-08-23T14:35:50.000Z","reading":73.4,"elevation":null,"room":null,"system":null},{"serial":"1D00080170496D10","date":"2013-08-23T14:36:20.000Z","reading":73.4,"elevation":null,"room":null,"system":null},{"serial":"1D00080170496D10","date":"2013-08-23T14:36:50.000Z","reading":73.4,"elevation":null,"room":null,"system":null},{"serial":"1D00080170496D10","date":"2013-08-23T14:37:20.000Z","reading":73.4,"elevation":null,"room":null,"system":null},{"serial":"1D00080170496D10","date":"2013-08-23T14:37:50.000Z","reading":73.4,"elevation":null,"room":null,"system":null},{"serial":"1D00080170496D10","date":"2013-08-23T14:38:20.000Z","reading":73.4,"elevation":null,"room":null,"system":null},{"serial":"1D00080170496D10","date":"2013-08-23T14:38:50.000Z","reading":73.4,"elevation":null,"room":null,"system":null},{"serial":"1D00080170496D10","date":"2013-08-23T14:39:20.000Z","reading":73.4,"elevation":null,"room":null,"system":null},{"serial":"1D00080170496D10","date":"2013-08-23T14:39:50.000Z","reading":73.4,"elevation":null,"room":null,"system":null},{"serial":"380008017037ED10","date":"2013-08-23T14:35:19.000Z","reading":74.3,"elevation":null,"room":null,"system":null},{"serial":"380008017037ED10","date":"2013-08-23T14:35:50.000Z","reading":74.3,"elevation":null,"room":null,"system":null},{"serial":"380008017037ED10","date":"2013-08-23T14:36:20.000Z","reading":74.3,"elevation":null,"room":null,"system":null},{"serial":"380008017037ED10","date":"2013-08-23T14:36:50.000Z","reading":74.3,"elevation":null,"room":null,"system":null},{"serial":"380008017037ED10","date":"2013-08-23T14:37:20.000Z","reading":74.3,"elevation":null,"room":null,"system":null},{"serial":"380008017037ED10","date":"2013-08-23T14:37:50.000Z","reading":74.3,"elevation":null,"room":null,"system":null},{"serial":"380008017037ED10","date":"2013-08-23T14:38:20.000Z","reading":74.3,"elevation":null,"room":null,"system":null},{"serial":"380008017037ED10","date":"2013-08-23T14:38:50.000Z","reading":74.3,"elevation":null,"room":null,"system":null},{"serial":"380008017037ED10","date":"2013-08-23T14:39:20.000Z","reading":74.3,"elevation":null,"room":null,"system":null},{"serial":"380008017037ED10","date":"2013-08-23T14:39:50.000Z","reading":74.3,"elevation":null,"room":null,"system":null}]
答案 0 :(得分：1)
使用调试器观察内存使用情况。删除代码。检查是否仍然发生内存泄漏。冲洗并重复。
另外，建议不要使用setInterval()。改为使用setTimeout()代替。