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javascript当中静态方法和prototype用法

6）静态方法和prototype（难）例 3.6.1 <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"/> </head> <script> /*note that 马克-to-win： static variable's value has nothing to do with instance's variable's value.instance 名称 can not 直接access static member like in java. This is different from Java，比如下面例子中，Student.number=2,但是d1.number就为undefined.This is different from Java，但在实例方法中（比如d1.info）可以访问Student.number。这是和java中一样的。或者说function外或任何地方都可以访问Student.number。反过来，d1.age也可以在静态方法中访问，就像在function外一样，任何地方都能访问d1.age。String.prototype.abcd，这是给所有的实例加属性而不是静态属性。*/ function Student(number, agev) { this.age = agev; /*static variable's value can not be accessed by instance */ Student.number = number; /*lb is local variable, but not a member variable because it is not modified by this. from outside it can not be accessed. refer to noblockScope.html */ var lb = 0; } var d1 = new Student(1, 3); document.writeln("this的age属性为means window.age" + this.age + "<br>"); document.writeln("d1的age属性为" + d1.age + "<br>"); document.writeln("d1的number属性为" + d1.number + "<br>"); document.writeln("通过Student访问静态number属性为" + Student.number + "<br>"); document.writeln("d1的lb属性为" + d1.lb + "<br><hr>"); d1.qixy = "abc";/*以随意为实例加属性或方法*/ document.writeln("可以随意为实例加属性或方法see following，d1的qixy属性为" + d1.qixy + "<br><hr>"); document.writeln("是否有静态变量qixy" + Student.qixy + "<br><hr>"); d1.info = function()/*此方法仅为d1对象所用*/ { document.writeln("对象的qixy属性:" + this.qixy); document.writeln("对象的age属性:" + this.age); /*下列话是合法的，因为不是this.number，而是Student.number*/ document.writeln("static method is " + Student.number); }; Student.prototype.infop = function()/*此方法可以为所有Student对象所用*/ { document.writeln("对象的qixy属性p:" + this.qixy); document.writeln("对象的age属性p:" + this.age);

马克java社区

2019-10-09

4290

SpringBoot中如何上传Upload

html servlet java c++

上传：根据第3部分的helloworld例子，用那个项目做底子。pom.xml都不用改变。参考项目bootUpload1. static/index.html: <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> </head> <body> index1 <form method="POST" action="/upload" enctype="multipart/form-data"> <input type="file" name="file" /><br/><br/> <input type="submit" value="Submit" /> </form> </body> </html> package com.SpringbootMaven; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.multipart.MultipartFile; import java.io.IOException; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import javax.servlet.http.HttpServletResponse; @Controller public class UploadController { private static String UPLOADED_FOLDER = "e://temp//"; @RequestMapping("/upload") public void singleFileUpload(@RequestParam("file") MultipartFile file,HttpServletResponse res) throws IOException { try { byte[] bytes = file.getBytes(); Path path = Paths.get(UPLOADED_FOLDER + file.getOriginalFilename()); Files.write(path, bytes); System.out.println("马克-to-win@马克java社区 successfully"); } catch (IOException e) { e.printStackTrace(); } res.sendRedirect("index.html"); } }

马克java社区

2019-07-27

4820

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