使用d3.js读取json文件

我编写了一个代码，使用d3.js读取csv文件。我的csv文件是

x1，y1，x2，y2 2.0000,0.0000,-4.0000,1.5000 1.9800,0.0000,-3.9500,1.5000 1.9600,0.0000,-3.9000,1.5000 1.9400,0.0000,-3.8500,1.5000 1.9200,0.0000，-3.8000,1.5000

我读取这个文件的代码是

d3.csv("./data.csv", function(err, data){
    data1 = data.map(function(d) { return [ +d["x1"], +d["y1"] ]; });
    data2 = data.map(function(d) { return [ +d["x2"], +d["y2"] ]; });})

此代码读取csv文件并将其数据保存到数组、data1和data2中

每个数组看起来像

数据1[0][0]=2.0000，数据1[0][1]=0.0000 数据1[1][0]=1.9800，数据1[1][1]=0.0000 数据1[2][0]=1.9600，数据1[2][1]=0.0000

现在，我想对读取json数据做完全相同的事情。 我的json代码是

var inputdata = [
{"y2": "1.5000", "x2": "-4.0000","y1": "0.0000", "x1": "2.0000"},
{"y2": "1.5000", "x2": "-3.9500","y1": "0.0000", "x1": "1.9800"},
{"y2": "1.5000", "x2": "-3.9000","y1": "0.0000", "x1": "1.9600"},
{"y2": "1.5000", "x2": "-3.8500","y1": "0.0000", "x1": "1.9400"},
{"y2": "1.5000", "x2": "-3.8000","y1": "0.0000", "x1": "1.9200"},
];

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那么，如何读取此json代码并将数据放入数组data1和data2中，就像上面的csv代码一样？

您可以这样做：

var inputdata = [
{"y2": "1.5000", "x2": "-4.0000","y1": "0.0000", "x1": "2.0000"},
{"y2": "1.5000", "x2": "-3.9500","y1": "0.0000", "x1": "1.9800"},
{"y2": "1.5000", "x2": "-3.9000","y1": "0.0000", "x1": "1.9600"},
{"y2": "1.5000", "x2": "-3.8500","y1": "0.0000", "x1": "1.9400"},
{"y2": "1.5000", "x2": "-3.8000","y1": "0.0000", "x1": "1.9200"},
];
    data1 = inputdata.map(function(d) { return [ +d["x1"], +d["y1"] ]; });
    data2 = inputdata.map(function(d) { return [ +d["x2"], +d["y2"] ]; });
//do your task with data1 and data2