用debugout还是无法在浏览器下导出log日志

Creator 2.x
#1

浏览器运行调用download无法下载文件
我也不知道为什么，控制台里一切正常
我是直接把debugout.js里代码贴过来用的
不知道谁能调试通过

https://github.com/inorganik/debugout.js

this.downloadLog = function() {

    var logFile = self.getLog();

        var blob = new Blob([logFile], { type: 'data:text/plain;charset=utf-8' });

        var a = document.createElement('a');

        a.href = window.URL.createObjectURL(blob);
        console.log("=============>a.href:"+ a.href);
        a.target = '_blank';

        a.download = self.logFilename;

        document.body.appendChild(a);

        a.click();
        console.log("=============>a.click:");
        document.body.removeChild(a);

        window.URL.revokeObjectURL(a.href);

}