有效沟通问答-【官方】百战程序员_IT在线教育培训机构

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        canvas{border: 1px solid red;}
    </style>
</head>
<body>
    <canvas width="300px" height="100px">你得u暗器不智灿canvas</canvas>
    <script>
        var mycanvas=document.querySelector('canvas');
        var ctx=mycanvas.getContext('2d');
        ctx.beginPath();
        ctx.strokeRect(0,0,300,100);
        var counter=0;
        var obj={};
        //请求图片
        var arr=['谢谢惠顾.jpg','中将.jpg']
        for(var i=0;i<arr.length;i++){
            var img=new Image();
             img.src=arr[i];
             obj[i]=img
            img.onload=function(){
                counter++;
                if(counter==arr.length){
                    callback(obj)
                }

            }
        }
        function callback(obj){
            var num=Math.ceil(Math.random()*10);
            if(num==8){
               // mycanvas.style.background='ur('+arr[1]+')'
            }else{
                mycanvas.style.background='ur('+arr[0]+')'
            }

        }
    </script>
</body>
</html>

老师为什么我图片的文字出不来

WEB前端全系列/第九阶段：HTML5新特性模块/（旧）H5新特性 7307楼

我想用import time测一下这两个代码那个更快为什么测不出来

Python 全系列/第一阶段：Python入门/控制语句 7308楼

import time
def wtritelog(func):
    try:
        file=open("log.txt","a",encoding="utf=8")
        file.write(func.__name__)
        file.write("\t")
        file.write(time.asctime())
        file.write("\n")
    except Exception as e:
           print(e.args)
    finally:
           file.close()
def funcOut(func):
    def funcIn():
        wtritelog(func)
        func()

    return funcIn



def func1():
    wtritelog(func1)
    print("我是功能1")

def func2():
    wtritelog(func2)
    print("我是功能2")
func1=funcOut(func1)
func2=funcOut(func2)

func1()
func2()


老师请问我这个运行出来为什么会多出来funIn啊

Python 全系列/第四阶段：函数式编程和核心特性/生成器和装饰器 7309楼

#coding=utf-8
# url和视图函数映射 url参数传递问题

from flask import Flask

app = Flask(__name__)


@app.route('/')
def hello_world():
    return 'Hello World!'

@app.route('/article/<id>/')
def list1(id):
    #思路：1.获取id号  2.拿id去操作数据库得到返回来的数据 3.把数据按格式返回给浏览器
    print (id)
    return '您请求的文章详情是。。。id是%s'%id


if __name__ == '__main__':
    #修改host
    app.run(host='0.0.0.0')
    
    
    
 问题：
 老师你好 我已经修改了host，但是同一台计算机用本地IP访问不了。本机防火墙也关闭了 
 以下是截图

Python 全系列/第八阶段：轻量级Web开发利器-Flask框架/Flask视图基础和URL 7310楼

老师。我输入正确的用户名和密码，但是登陆不上。控制台又没有报错。

webdemo.rar

JAVA 全系列/第五阶段：JavaWeb开发/Web实战案例 7311楼

自己尝试了各种方法均未能解决，最后还是想请问下老师，我启动dubbo_moniror的start.bat报错如下：

Java HotSpot(TM) 64-Bit Server VM warning: Ignoring option MaxPermSize; support was removed in 8.0

log4j:WARN No appenders could be found for logger (com.alibaba.dubbo.common.logger.LoggerFactory).

log4j:WARN Please initialize the log4j system properly.

log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.alibaba.dubbo.monitor.MonitorService': Instantiation of bean failed; nested exception is java.lang.ExceptionInInitializerError

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:883)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:839)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:440)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)

at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)

at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264)

at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)

at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261)

at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)

at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)

at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:308)

at org.springframework.context.support.AbstractApplicationContext.getBeansOfType(AbstractApplicationContext.java:947)

at org.springframework.context.support.AbstractApplicationContext.registerListeners(AbstractApplicationContext.java:701)

at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:377)

at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)

at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:93)

at com.alibaba.dubbo.container.spring.SpringContainer.start(SpringContainer.java:50)

at com.alibaba.dubbo.container.Main.main(Main.java:80)

Caused by: java.lang.ExceptionInInitializerError

at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)

at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500)

at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481)

at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:100)

at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:61)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:877)

... 18 more

Caused by: java.lang.IllegalStateException: fail to create adaptive instance: java.lang.IllegalStateException: Can not create adaptive extenstion interface com.alibaba.dubbo.rpc.Protocol, cause: java.io.IOException: invalid constant type: 18

at com.alibaba.dubbo.common.extension.ExtensionLoader.getAdaptiveExtension(ExtensionLoader.java:459)

at com.alibaba.dubbo.config.ServiceConfig.<clinit>(ServiceConfig.java:60)

... 26 more

Caused by: java.lang.IllegalStateException: Can not create adaptive extenstion interface com.alibaba.dubbo.rpc.Protocol, cause: java.io.IOException: invalid constant type: 18

at com.alibaba.dubbo.common.extension.ExtensionLoader.createAdaptiveExtension(ExtensionLoader.java:723)

at com.alibaba.dubbo.common.extension.ExtensionLoader.getAdaptiveExtension(ExtensionLoader.java:455)

... 27 more

Caused by: java.lang.RuntimeException: java.io.IOException: invalid constant type: 18

at javassist.CtClassType.getClassFile2(CtClassType.java:204)

at javassist.CtClassType.subtypeOf(CtClassType.java:304)

at javassist.compiler.MemberResolver.compareSignature(MemberResolver.java:248)

at javassist.compiler.MemberResolver.lookupMethod(MemberResolver.java:120)

at javassist.compiler.MemberResolver.lookupMethod(MemberResolver.java:97)

at javassist.compiler.MemberCodeGen.atMethodCallCore(MemberCodeGen.java:562)

at javassist.compiler.MemberCodeGen.atCallExpr(MemberCodeGen.java:524)

at javassist.compiler.JvstCodeGen.atCallExpr(JvstCodeGen.java:244)

at javassist.compiler.ast.CallExpr.accept(CallExpr.java:46)

at javassist.compiler.MemberCodeGen.atCallExpr(MemberCodeGen.java:497)

at javassist.compiler.JvstCodeGen.atCallExpr(JvstCodeGen.java:244)

at javassist.compiler.ast.CallExpr.accept(CallExpr.java:46)

at javassist.compiler.MemberCodeGen.atCallExpr(MemberCodeGen.java:497)

at javassist.compiler.JvstCodeGen.atCallExpr(JvstCodeGen.java:244)

at javassist.compiler.ast.CallExpr.accept(CallExpr.java:46)

at javassist.compiler.MemberCodeGen.atCallExpr(MemberCodeGen.java:497)

at javassist.compiler.JvstCodeGen.atCallExpr(JvstCodeGen.java:244)

at javassist.compiler.ast.CallExpr.accept(CallExpr.java:46)

at javassist.compiler.CodeGen.atBinExpr(CodeGen.java:964)

at javassist.compiler.ast.BinExpr.accept(BinExpr.java:41)

at javassist.compiler.JvstCodeGen.atMethodArgs(JvstCodeGen.java:358)

at javassist.compiler.MemberCodeGen.atMethodCallCore(MemberCodeGen.java:556)

at javassist.compiler.MemberCodeGen.atNewExpr(MemberCodeGen.java:302)

at javassist.compiler.ast.NewExpr.accept(NewExpr.java:73)

at javassist.compiler.CodeGen.compileExpr(CodeGen.java:230)

at javassist.compiler.CodeGen.atThrowStmnt(CodeGen.java:628)

at javassist.compiler.CodeGen.atStmnt(CodeGen.java:365)

at javassist.compiler.ast.Stmnt.accept(Stmnt.java:50)

at javassist.compiler.CodeGen.atIfStmnt(CodeGen.java:391)

at javassist.compiler.CodeGen.atStmnt(CodeGen.java:355)

at javassist.compiler.ast.Stmnt.accept(Stmnt.java:50)

at javassist.compiler.CodeGen.atStmnt(CodeGen.java:351)

at javassist.compiler.ast.Stmnt.accept(Stmnt.java:50)

at javassist.compiler.CodeGen.atMethodBody(CodeGen.java:292)

at javassist.compiler.CodeGen.atMethodDecl(CodeGen.java:274)

at javassist.compiler.ast.MethodDecl.accept(MethodDecl.java:44)

at javassist.compiler.Javac.compileMethod(Javac.java:169)

at javassist.compiler.Javac.compile(Javac.java:95)

at javassist.CtNewMethod.make(CtNewMethod.java:74)

at javassist.CtNewMethod.make(CtNewMethod.java:45)

at com.alibaba.dubbo.common.compiler.support.JavassistCompiler.doCompile(JavassistCompiler.java:119)

at com.alibaba.dubbo.common.compiler.support.AbstractCompiler.compile(AbstractCompiler.java:59)

at com.alibaba.dubbo.common.compiler.support.AdaptiveCompiler.compile(AdaptiveCompiler.java:46)

at com.alibaba.dubbo.common.extension.ExtensionLoader.createAdaptiveExtensionClass(ExtensionLoader.java:739)

at com.alibaba.dubbo.common.extension.ExtensionLoader.getAdaptiveExtensionClass(ExtensionLoader.java:732)

at com.alibaba.dubbo.common.extension.ExtensionLoader.createAdaptiveExtension(ExtensionLoader.java:721)

... 28 more

Caused by: java.io.IOException: invalid constant type: 18

at javassist.bytecode.ConstPool.readOne(ConstPool.java:1113)

at javassist.bytecode.ConstPool.read(ConstPool.java:1056)

at javassist.bytecode.ConstPool.<init>(ConstPool.java:150)

at javassist.bytecode.ClassFile.read(ClassFile.java:765)

at javassist.bytecode.ClassFile.<init>(ClassFile.java:109)

at javassist.CtClassType.getClassFile2(CtClassType.java:191)

... 73 more

请按任意键继续. . .

JAVA 全系列/第十一阶段：分布式RPC调用和分布式文件存储/Dubbo 7312楼

我看见好像跟别的同学问的都一样，但是咱们之前的资料里都是1.8.0的版本的nginx，也没有找到视频里这个版本的，然后现在nginx也安装不上去，这个怎么解决一下呢？

JAVA 全系列/第十八阶段：亿级高并发电商项目_架构/编码（旧）/电商：基于FastDFS+Nginx+Kinkeditor实现商品新增 7313楼

        var gwlbb="天上明月光，疑是地上霜，能做我女朋友吗?举头望明月，低头思故乡";
        if(gwlbb.indexOf("能做我女朋友吗?")>-1){
            console.log("表白成功");
        }else{
            console.log("表白失败");
        }

我这个为什么显示的是表白失败？

var hello="hello world";

console.log(hello.indexOf(""));

我想显示中间那个空白的启示位置为什么显示的是0？

JAVA 全系列/第四阶段：网页编程和设计/JavaScript语言 7314楼

老师这个include标签是做什么用的好像没讲到

JAVA 全系列/第六阶段：项目管理与SSM框架/Mybatis 7315楼

enumerate 的用法是什么？

Python 全系列/第一阶段：Python入门/序列 7316楼

老师，

placeholder

属性是什么

JAVA 全系列/第十阶段：百战旅游网项目/百战旅游网 7317楼

为什么这里，打好了代码没有运行的选项，并且名字呈现红色的线

JAVA 全系列/第一阶段：JAVA 快速入门/控制语句、方法、递归算法 7318楼

运行不了，第5行还是会出错，单单运行窗口还可以，但是运行送花的代码的时候就出错

Python 全系列/第二阶段：Python 深入与提高/GUI编程（隐藏） 7319楼

老师的代码为啥会报错

JAVA 全系列/第十三阶段：分布式文件存储与数据缓存/Redis 7320楼

同学您好