function readTextFile(file, callback) {
var rawFile = new XMLHttpRequest();
rawFile.overrideMimeType("application/json");
rawFile.open("GET", file, true);
rawFile.onreadystatechange = function () {
if (rawFile.readyState === 4 && rawFile.status == "200") {
callback(rawFile.responseText);
}
};
rawFile.send(null);
}
readTextFile("./data/1.2.区域图.json", function (text) {
let data = JSON.parse(text);
});
