ReferenceError: "_" is not defined

Question

recipe = new Recipe(_.pick(req.body, ['name', 'tag', 'recipe']));
    await recipe.save();
    

}); 

错误：

recipe = new Recipe(_.pick(req.body, ['name', 'tag', 'recipe']));
                    ^

ReferenceError: _ is not defined

Answer 1

你必须像这样使用它之前导入库

// Requiring the lodash library
const _ = require("lodash");

// The source object
var obj = {
    Name: "GeeksforGeeks",
    password: "gfg@1234",
    username: "your_geeks"
}

// Using the _.pick() method
console.log(_.pick(obj, ['password', 'username']));