使用D3图表更新d3图表的最佳方法是什么

您只需在ajax成功中调用d3函数：

$.ajax({
type: "POST",
contentType: "application/json; charset=utf-8",
url: 'url to your web servise',
dataType: 'json',
async: true,
data: "{}",
success: function (data) {
var pos_data = data;
div_name = "div.histogram";
draw_histogram(div_name, pos_data);
},
error: function (result) {
}
})
//The drawing of the histogram has been broken out from the data retrial
// or computation. (In this case the 'Irwin-Hall distribution' computation above)
function draw_histogram(reference, pos_data){
$(reference).empty()
//The drawing code needs to reference a responsive elements dimneions
var width = $(reference).width();
// var width = $(reference).empty().width(); we can chain for effeicanecy as jquery returns jquery.
// var height = 230; // We don't want the height to be responsive.
var margin = {top: 10, right: 30, bottom: 40, left: 30},
// width = 960 - margin.left - margin.right,
height = 270 - margin.top - margin.bottom;
var histogram = d3.layout.histogram() (pos_data);
//var neg_histogram = d3.layout.histogram()(neg_data);
var x = d3.scale.ordinal()
.domain(histogram.map(function(d) { return d.x; }))
.rangeRoundBands([0, width]);
var xAxis = d3.svg.axis()
.scale(x)
.orient("bottom");
var y = d3.scale.linear()
.domain([0, d3.max(histogram.map(function(d) { return d.y; }))])
.range([0, height]);
//var ny = d3.scale.linear()
// .domain([0, d3.max(neg_histogram.map(function(d) { return d.y; }))])
// .range([0, height]);
var svg = d3.select(reference).append("svg")
.attr("width", width)
.attr("height", height + 20);
svg.selectAll("rect")
.data(histogram)
.enter().append("rect")
.attr("width", x.rangeBand())
.attr("x", function(d) { return x(d.x); })
.attr("y", function(d) { return height - y(d.y); })
.attr("height", function(d) { return y(d.y); });
svg.append("line")
.attr("x1", 0)
.attr("x2", width)
.attr("y1", height)
.attr("y2", height);
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + (height) + ")")
.call(xAxis);
};
//Bind the window resize to the draw method.
//A simple bind example is
//A better idom for binding with resize is to debounce
var debounce = function(fn, timeout)
{
var timeoutID = -1;
return function() {
if (timeoutID > -1) {
window.clearTimeout(timeoutID);
}
timeoutID = window.setTimeout(fn, timeout);
}
};
var debounced_draw = debounce(function() {
draw_histogram(div_name, pos_data);
}, 125);
$(window).resize(debounced_draw);