each

　　遍历应该是各种语言中常会用到的操作了，实现的方法也很多，例如使用for、while等循环语句就可以很轻松的做到对数组或对象的遍历，今天想讲的不是它们，而是简单方便的遍历方法。 　　大致的整理了一下，经常用到的大概有Jquery的$.each、$.map、each()、map()、get()、toArray()以及js原生的forEach()吧，当然肯定还有一些我不知道的，今天就先谈谈$.each()和$.map()区别。 $.each() $.each()方法可用于遍历任何对象(包括数组)，结构为：$.each(array/object,function(index/key,value){ code })。index指遍历对象成员的索引，value指成员的内容。如果需要退出循环可使回调函数返回 false，其它返回值将被忽略。 上栗子： //遍历数组 $(function(){ var arr = ["a","b","c","d"]; $.each(arr,function(index,value){ console.log(value+" "+index); }); }); 结果依次输出 a0 b1 c2 d3 如果你在循环中放入console.log(this)，结果会依次输出string{a}。。。也就是表明返回值为对象。 //遍历对象 $(function(){ var

今天使用jquery的each遍历的使用，发现使用return之后，程序不会停止执行，而是会继续往下执行。 1 $.each(allTpInfo, function (index, value) { 2 if (value.username == username) { 3 return 4 } 5 }); 原来在each代码块中 return false = break return ture = continue 在each里使用 return 给整个函数返回时，其实只是跳出each循环而已 参考：https://www.jianshu.com/p/6065e464ca08 处理办法就是可以添加一个“标记”。如下代码显示。添加一个Boolean类型的变量flag，如果需要停止执行，则设flag为true。 1 var flag = false; 2 $.each(allTpInfo, function (index, value) { 3 if (value.username == username) { 4 flag = true; 5 } 6 }); 7 if (flag) { 8 return; 9 } 参考：https://blog.csdn.net/qq_39327418/article/details/90177286 来源： https://www.cnblogs

　　JMH，即Java Microbenchmark Harness，是专门用于代码微基准测试的工具套件。何谓Micro Benchmark呢？简单的来说就是基于方法层面的基准测试，精度可以达到微秒级。当你定位到热点方法，希望进一步优化方法性能的时候，就可以使用JMH对优化的结果进行量化的分析。 　　JMH比较典型的应用场景有： 想准确的知道某个方法需要执行多长时间，以及执行时间和输入之间的相关性； 对比接口不同实现在给定条件下的吞吐量，找到最优实现 查看多少百分比的请求在多长时间内完成 　　1 、JMH环境搭建 1 <dependency> 2 <groupId>org.openjdk.jmh</groupId> 3 <artifactId>jmh-core</artifactId> 4 <version>0.7.1</version> 5 </dependency> 6 <dependency> 7 <groupId>org.openjdk.jmh</groupId> 8 <artifactId>jmh-generator-annprocess</artifactId> 9 <version>0.7.1</version> 10 <scope>provided</scope> 11 </dependency> 12 13 <plugin> 14 <groupId>org

I'm trying to get the text inside all h2 tags on a page, using the web console. All I've found says to use each, I've tried var anArray = []; $('h2').each( function(i,e) { anArray.push($(e).innerHTML); }); But it returns TypeError: $(...).each is not a function. I've also tried using $.each('h2', function(i,e) { anArray.push($(e).innerHTML); }); But again, all I get is TypeError: $.each is not a function? 1) Paste: var script = document.createElement('script'); script.src = "https://ajax.googleapis.com/ajax/libs/jquery/1.6.3/jquery.min.js"; document.getElementsByTagName('head')[0].appendChild

POJ_3013_最短路 Big Christmas Tree Time Limit: 3000MS Memory Limit: 131072K Total Submissions: 23630 Accepted: 5125 Description Christmas is coming to KCM city. Suby the loyal civilian in KCM city is preparing a big neat Christmas tree. The simple structure of the tree is shown in right picture. The tree can be represented as a collection of numbered nodes and some edges. The nodes are numbered 1 through n . The root is always numbered 1. Every node in the tree has its weight. The weights can be different from each other. Also the shape of every available edge between two nodes is different, so

I'm doing something wrong here but I can't see it! Im trying to loop an array in a underscore template. It doesn't work though so I'm missing something, Here's my code, my templates work fine otherwise, it's just the _.each stuff that's bugging out: <script type="text/template" id="PageContent"> <div class="col2"> <@ _.each([0,1,2,3,4], function(i) { @> <p><@ i @></p> <@ }); @> </div> </script> I've also done some template settings like this: _.templateSettings = { interpolate: /\<\@(.+?)\@\>/gim }; Because you've only defined an interpolation regex in your custom template settings, underscore

Sub 遍历() For Each F In Dir遍历 'Office2003遍历,FSO遍历,双字典遍历,CMD遍历,栈遍历,管道遍历,Dir遍历 '此处加入文件处理代码即可。 Selection.InsertAfter F & Chr(13) i = i + 1 Next Selection.InsertAfter i MsgBox "OKOK!!!", vbOKOnly, "OKKO" End Sub Sub 单个文档处理(F) Dim pa As Paragraph, c As Range With Documents.Open(F, Visible:=False) For Each pa In .Paragraphs For Each c In pa.Range.Characters If c.Font.Name = "仿宋" And Abs(Asc(c)) > 128 Then c.Font.Name = "仿宋_GB2312" ElseIf c.Font.Name = "仿宋" And Abs(Asc(c)) < 128 Then c.Font.Name = "Times New Roman" End If Next Next .Close True End With End Sub ' 遍历文件夹 Function CMD遍历() Dim arr Dim t: t