break | 易学教程

JavaScript 学习笔记

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程序结构 :JavaScript脚本语言只提供了两种结构:条件结构, 循环结构 If语句: <html > <head> <title>IF语句的使用</title> </head> <body> <script language="javascript"> function rec(form) { var a=form.recshortth.value; { if(a>60) alert("及格"); else alert("不及格"); } } </script> <form> <input type="text" name="recshortth"><br> <input name="button" type="button" onclick="rec(this.form)" value="显示"> </form> </body> </html> For语句: <html> <head> <title>For语句循环</title> </head> <body> <script language="javascript"> var i=1 for(i=1;i<=4;i++) { document.write("<h",i,">欢迎大家一起来学习JavaScript!</h",i,">"); } </script> </body> </html> Do While语法

C# exif 信息

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public void FindExifinfo(string filePath) { Image img = Image.FromFile(filePath); PropertyItem[] pt = img.PropertyItems; for (int i = 0; i < pt.Length; i++) { PropertyItem p = pt[i]; switch (pt[i].Id) { // 设备制造商 20. case 0x010F: this.textBox1.Text = System.Text.ASCIIEncoding.ASCII.GetString(pt[i].Value); break; case 0x0110: // 设备型号 25. this.textBox4.Text = GetValueOfType2(p.Value); break; case 0x0132: // 拍照时间 30. this.textBox2.Text = GetValueOfType2(p.Value); break; case 0x829A: // .曝光时间 this.textBox3.Text = GetValueOfType5(p.Value)+" sec"; break; case 0x8827: // ISO 40. this.textBox5.Text =

Can i use continue and break in an if statement without any loops in JAVASCRIPT?

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问题 It's well-known that break and continue can be used inside a loop: for (let i = 0; i < 5; i++) { console.log(i); if (i === 3) { break; } } Is there any way to those in just an if statement instead, outside a loop, to break out of or restart the if statement? 回答1: The answer is different for break (yes) and continue (no). break You can use break in an if , yes, if you label the if . I wouldn't , but you can : foo: if (true) { console.log("In if before break"); break foo; console.log("In if

Levenshtein distance with bound/limit

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问题 I have found some Python implementations of the Levenshtein distance. I am wondering though how these algorithms can be efficiently modified so that they break if the Levenshtein distance is greater than n (e.g. 3) instead of running until the end? So essentially I do not want to let the algorithm run for too long to calculate the final distance if I simply want to know if the distance is greater than a threshold or not. I have found some relevant posts here: Modifying Levenshtein Distance

Levenshtein distance with bound/limit

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upload 上传类

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<?php /** file: fileupload.class.php 文件上传类FileUpload 本类的实例对象用于处理上传文件，可以上传一个文件，也可同时处理多个文件上传 */ class Upload { private $path = "./uploads"; //上传文件保存的路径 private $allowtype = array('jpg','gif','png'); //设置限制上传文件的类型 private $maxsize = 1000000; //限制文件上传大小（字节） private $israndname = true; //设置是否随机重命名文件， false不随机 private $originName; //源文件名 private $tmpFileName; //临时文件名 private $fileType; //文件类型(文件后缀) private $fileSize; //文件大小 private $newFileName; //新文件名 private $errorNum = 0; //错误号 private $errorMess=""; //错误报告消息 /** * 用于设置成员属性（$path, $allowtype,$maxsize, $israndname） * 可以通过连贯操作一次设置多个属性值 *@param

How to stop Get-Content -wait after I find a particular line in the text file using powershell? Exit a pipeline on demand

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问题 I am using this below script in Powershell (Version is 5.1): Get-Content -Path path\to\text\file\to\be\read.txt -Wait Now this continues to read even after the file is getting no update. How can I stop after I find particular line in the text file? Is there any other way to stop this on condition? 回答1: You can pipe the output and use foreach to check each line, if the line equals a certain string you can use break to stop the command: Get-Content path\to\text\file\to\be\read.txt -wait | % {$_

Java基础之选择语句--switch

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Java 基础之选择语句 --switch switch 语句格式： switch(表达式) { case 常量值1: 语句体1; break; case 常量值2: 语句体2; break; ... default: 语句体n+1; break; } 执行流程 o 首先计算出表达式的值 o 其次，和case依次比较，一旦有对应的值，就会执行相应的语句，在执行的过程中，遇到break就会结束。 o 最后，如果所有的case都和表达式的值不匹配，就会执行default语句体部分，然后程序结束掉。要求这个表达式最后必须能计算出一个准确的结果，并且这个结果的类型只能是 byte short intchar enum（枚举），在JDK7以后增加了字符串类型。 break的作用是结束switch语句，跳出switch语句。 switch语句练习-春夏秋冬 o 需求：一年有12个月，分属于春夏秋冬4个季节，键盘录入一个月份，请用程序实现判断该月份属于哪个季节，并输出。 o 演示效果输入： 1 、 2 、 12 输出：冬季输入： 3 、 4 、 5 输出：春季输入： 6 、 7 、 8 输出：夏季输入： 9 、 10 、 11 输出：秋季输入：其它数字输出：数字有误 public static void main(String[] args) { //定义月份变量，判断季节

JavaScript break和continue

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break 经常用来结束本次循环实例 < ! DOCTYPE html > < html lang = "en" > < head > < meta charset = "UTF-8" > < meta name = "viewport" content = "width=device-width, initial-scale=1.0" > < meta http - equiv = "X-UA-Compatible" content = "ie=edge" > < title > Document < / title > < / head > < body > < button onclick = "myFunction()" > click < / button > < p id = "demo" > < / p > < script > function myFunction ( ) { var text = "" ; for ( var i = 0 ; i < 5 ; i ++ ) { if ( i == 3 ) { break ; } text = text + "The Number is:" + i + "<br>" ; } document . getElementById ( "demo" ) . innerHTML = text ; } < / script

JS for循环中的label

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