如题：

case "sync":
                fn = new Function(
                    this.args(),
                    '"use strict";\n' +
                        this.header() +
                        this.content({
                            onError: err => `throw ${err};\n`,
                            onResult: result => `return ${result};\n`,
                            onDone: () => "",
                            rethrowIfPossible: true
                        })
                );
                break;