Question

我一直在这个问题上停留太久了。这是我要回答的问题：

//write a forEach loop that loops through this example array and prints out the type of each element

var arr = [{name:'Pedrito'}, ['Banana'],false,34,'hello',null,undefined]

Answer 1

var arr = [{name:'Pedrito'}, ['Banana'],false,34,'hello',null,undefined]

arr.forEach(e => console.log(typeof e));

Answer 2

您可以使用以下方法：

arr.forEach( item => console.log(typeof item) );

Answer 3

FYI typeof均为小写：

arr.forEach(element => console.log(typeof element))

Answer 4

您可以使用以下解决方案：

// Serve static content for the app from the "public" directory in the application directory.
// if production env, use build folder for static files
if (process.env.NODE_ENV === "production") {
  app.use(express.static("client/build"));
}

// for local env, use /client/public folder
else {
  app.use(express.static(path.join(__dirname, '/client/public')));
}

// server the client index.html file for all requests
app.get("*", function(req, res) {
  res.sendFile(path.join(__dirname, "./client/public/index.html"));
});

日志：

var arr = [{name:'Pedrito'}, ['Banana'],false,34,'hello',null,undefined]

arr.forEach(function(element){
    console.log(typeof element)
})

帮助在JavaScript的forEach循环中使用typeOf

4 个答案: