eval | 易学教程

jquery 项目所用

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javascript eval and object evaluation

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问题 I have a part of a debugging framework that needs to be able to run time eval objects. Specifically, if I have a string like this "{a: 1, b:2}" it needs to evaluate it into an object with members a and b with those values. However, if I do eval("{a: 1, b:2}") it seems to evaluate it as a statement, and says something about an illegal label. I have hacked it so that it evaluates like this: eval("var x=" + str + "; x;"); which seems to work, but seems like a horrible hack. Any suggestions on

javascript eval and object evaluation

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Is there C/C++ equivalent of eval(“function(arg1, arg2)”)?

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问题 it need a way to call function whose name is stored in a string similar to eval. Can you help? 回答1: C++ doesn't have reflection so you must hack it, i. e.: #include <iostream> #include <map> #include <string> #include <functional> void foo() { std::cout << "foo()"; } void boo() { std::cout << "boo()"; } void too() { std::cout << "too()"; } void goo() { std::cout << "goo()"; } int main() { std::map<std::string, std::function<void()>> functions; functions["foo"] = foo; functions["boo"] = boo;

Is there C/C++ equivalent of eval(“function(arg1, arg2)”)?

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#Eval if statement in repeater

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问题 I'm trying to check a string value inside a repeater, and if it has value then write a link, but can't seem to get it to work. If there is a value in myUrl then I want to display the link. <%if( %> <%#Eval("myURL").ToString().Length > 0 %> <a title="myTitle" target="_blank" href="<%# Eval("myURL") %>">my link</a> <% } %> Can anyone please help? 回答1: try this code !!! <%#Eval("myURL").ToString().Length > 0 ? "<a title='myTitle' target='_blank' href='<%# Eval("myURL") %>'>my link</a>":""%> 回答2:

shell变量详解

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> shell变量详解 1 shell变量基础 shell变量是一种很“弱”的变量，默认情况下，一个变量保存一个串，shell不关心这个串是什么含义。所以若要进行数学运算，必须使用一些命令例如let、declare、expr、双括号等。shell变量可分为两类：局部变量和环境变量。局部变量只在创建它们的shell中可用。而环境变量则可以在创建它们的shell及其派生出来的任意子进程中使用。有些变量是用户创建的，其他的则是专用shell变量。变量名必须以字母或下划线字符开头。其余的字符可以是字母、数字(0~9)或下划线字符。任何其他的字符都标志着变量名的终止。名字是大小写敏感的。给变量赋值时，等号周围不能有任何空白符。为了给变量赋空值，可以在等号后跟一个换行符。用set命令可以查看所有的变量，unset var命令可以清除变量var，var相当于没有定义过。readonly var可以把var变为只读变量，定义之后不能对var进行任何更改。对shell变量的引用方式很多，用这些方式可以方便的获取shell变量的值，变量值的长度，变量的一个字串，变量被部分替换后的值等等。shell变量常见引用方式如下： 2 环境变量环境变量的定义方法如下： var=value export var

Python之汉诺塔问题及python安全

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Python之汉诺塔问题今天学习了一下汉诺塔问题，像了许久啊！！脑袋不太OK！记得上次看到汉诺塔是我在看电影的时候，电影场景里给大猩猩测试智商的。。。。这里使用的是Python3编写的代码，毕竟大家都知道2020年的1月1日Python2已经正式退休了。下面是Python3的时代了。发现规律后就会意识到这个就是一个递归函数，挺明显的。代码如下： ''' 下面是汉诺塔问题不同的圆盘个数实现任务的次数规律： n=1 a=1 f(x) = 1 n=2 a=3 f(2) = 2*f(1)+1 n=3 a=7 f(3) = 2*f(2)+1 n=4 a=15 f(4) = 2*f(3)+1 ... ... f(n) = 2*f(n-1)+1 ''' def Move ( n , a , b , c ) : if n == 1 : print ( a , '--->' , c ) #如果只有一个圆盘就直接把它从A拿到C，并且结束程序。 return 0 else : #不是一个圆盘那么就要对n-1个圆盘从A移到B Move ( n - 1 , a , c , b ) print ( a , '--->' , c ) #把最底下的那个从A移动到C Move ( n - 1 , b , a , c ) #最后把在B的n-1个圆盘移动到C number = input ( '请输入圆盘的个数

Prevent Cross site scripting attack in asp.net C#

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问题 Below is the code for which I got checkmarx report stating that its vulnerable to stored XSS.it says the data layer gets data from the database, for the dt element. This element’s value then flows through the code without being properly filtered or encoded and is eventually displayed to the user in aspx page. <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" OnRowCancelingEdit="GridView1_RowCancelingEdit" OnRowEditing="GridView1_RowEditing" OnRowUpdating="GridView1

Get the value of a variable with with the same name as the value of a string

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问题 I have a jQuery widget that outputs a table of contents when invoked. I'd like to give users the oppurtunity to specify the ID of each individal element within the contents ( listElementID: 'contents-{index}' by default), so I've come up with a function within the widget to achieve this. There criteria for this is quite simple - Replace {index} with the value of the index parameter that is passed to the function. Replace and other instance of {.*} (I.e. {whatever} with the matching widget