console.save = function(data, filename) {
let MIME_TYPE = "text/json";
if (!data) return;
if (!filename) filename = "console.json";
if (typeof data === "object") data = JSON.stringify(data, null, 4);
let blob = new Blob([data], { type: MIME_TYPE });
let e = document.createEvent("MouseEvent");
let a = document.createElement("a");
a.download = filename;
a.href = window.URL.createObjectURL(blob);
a.dataset.downloadurl = [MIME_TYPE, a.download, a.href].join(":");
e.initMouseEvent("click", true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
a.dispatchEvent(e);
};
})(console);
执行
```
console.save(JSON.stringify({ "name": "John", "age": 30 }, null, 4), "example.json");
```
