nodeper8楼•4 个月前
letopt=10letcallback=function(x,y){console.log(x,y)}getUser(opt,callback)
`TypeError: callback is not a function at validateuser (index.vue?0dbc:132) at VueComponent.data (index.vue?0dbc:186) at getData (vue.esm.js?efeb:4751) at initData (vue.esm.js?efeb:4708) at initState (vue.esm.js?efeb:4645) at VueComponent.Vue._init (vue.esm.js?efeb:5009) at...
TypeError [ERR_INVALID_CALLBACK]:回调必须是函数 var fs = require('fs'); fs.readFile('readMe.txt', 'utf8', function (err, data) { fs.writeFile('writeMe.txt', data); }); 原文由Thirupparan发布,翻译遵循 CC BY-SA 4.0 许可协议 const {readFile} = require('fs'); const {writeFile...
问完成writeStream时出现"callback is not a function“错误EN在创建销售订单时,保存之后,出现如下显示...
Bug Report Current behavior I'm using WebSocketGateway with redis-io adapter. I'm trying to broadcast a message to all clients that are connected to a room, and I get this exception: TypeError: callback is not a function [0] at Encoder.e...
A "callback" is any function that is called by another function which takes the first function as a parameter. (在一个函数中调用另外一个函数就是callback) 以下是一个最简单的例子: functiona(){return1}functionb(aa){return2+aa}//调用:varc=0c=b(a())//A是个函数,但它又作为一个参数在...
A callback is afunctionthat is passedasan argument to anotherfunctionand is executed after its parentfunctionhas completed. 翻译:回调函数是作为参数传递给另一个函数的函数,在父函数完成后执行。 2、例子说明 varfs =require("fs");varafunctionf(x) {console.log(x) ...
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Node.js学习 - CallBack Function Node.js异步编程的直接体现就是回调,Node使用了大量的回调函数,其所有的API都支持回调。 阻塞代码实例(同步) varfs = require("fs");vardata = fs.readFileSync('input.txt'); #读取文件,程序阻塞在这里,等待读取完毕再往下进行...