code: function checkServerScript() {
        var root = opt.root;
  
        var script = path.join(root, 'server.js');
        var builtInScript = path.join(__dirname, 'node', 'server.js');
  
        if (!fis.util.exists(script)) {
  
          var callback = this;
          extract(path.join(__dirname, 'node', 'server.tar'), root, function() {
            if (!checkDeps(root)) {
              installNpmDependencies(path.join(root, 'package.json'), root, opt.registry, callback);
            } else {
              callback();
            }
          });
        } else if (!checkDeps(root)) {
          installNpmDependencies(path.join(root, 'package.json'), root, opt.registry, this);
        } else {
          this();
        }
      }
docs: 检测 script 脚本