literals

问题 This question already has an answer here : What are the rules for invoking functions on number literals in JS? [duplicate] (1 answer) Closed 3 years ago . In Chrome console, also test in edge and firefox 5.toFixed(2); get Uncaught SyntaxError: Invalid or unexpected token in chrome. SyntaxError: identifier starts immediately after numeric literal in firefox. Expected ';' in edge. But code below 5.1.toFixed(2); (5).toFixed(2); is ok in all three browsers above. 回答1: This is because of the

问题 This question already has answers here : Why does an elisp local variable keep its value in this case? (3 answers) Closed 3 years ago . I noticed that when I call the function fillBoard, it seems to work as it fills the list passed to it as I want, but it has a very weird side effect. Somehow once fillBoard is called, the clearBoard function will only return the list returned by fillBoard. Additionally if I call fillBoard again it will continue to update the value returned in clearBoard. As

问题 I've got a bunch of HTML: <div align="center" id="whatever"> <a href="http://www.whatever.com" style="text-decoration:none;color:black"> <img src="http://www.whatever.com/images/whatever.jpg" /> </a></div> I want to output it all as literal HTML in the browser, i.e. display the above to the user. (EDIT: unfortunately I don't have access to Django variables in my template, due to the quirks of the system I'm working on, so I can't use {{ | escape }} . Is there any way to do this, either using

问题 Evening all, What would be the correct key sequence to display "\t" as a literal value, and not a text format? My code is below... Thanks a bunch. main() { int c; while ((c = getchar()) != EOF) { if (c == ' ') c = "\t"; putchar(c); } } So to clarify, I do not want to have a tabbed string, but instead display the characters \t. 回答1: You can escape a backslash with another backslash, i.e. "\\t" . Incidentally, you're trying to assign a string (i.e. more than one character) to an int . This

问题 I have following function: function doSomething(param1: string, param2: string) { return param1 + param2; } also I have json based type with structure looking similar to this: a1: { b1: 'something1', b2: 'something2', b3: 'something3' }, a2: { c1: 'something4', c2: 'something5' } ...etc I want nth argument of mentioned function to be literal of nth deep elements, so if first argument is 'a1' , second should be 'b1' | 'b2' | 'b3' , and if first argument is 'a2' , second should be 'c1' | 'c2' .

问题 I'm probably missing something really basic on javascript knowledge, but why doesn't this work? var person = { name:"", age:0, set : function(name,age){ this.name = name; this.age = age; } } var me = new person; // ERROR: Object doesn't support this action! me.set('Victor',12); me.name //Victor But this does: var person = function(){ this.name=""; this.age=0; this.set = function(name,age){ this.name=name; this.age=age; } } var me = new person(); //WORKS! me.set('Victor',12); me.name; //Victor

问题 I'm trying to make constexpr some existing code, but getting message error: 'my_string' declared 'static' in 'constexpr' function Much simplified, the code is: template <typename T> constexpr int foo(const int x) { static // error: 'my_string' declared 'static' in 'constexpr' function constexpr char my_string[] = "my foo error message!"; if (x == 0) { std::cout << my_string << std::endl; } return x; } class boo { public: constexpr boo() { static // error: 'constructor_string' declared 'static

问题 I have a problem,I saw that the address of two pointers are same as in question here(Addresses of two pointers are same), also answered by blue moon. Which lead me to some more doubts. Since both the pointers have same address I thought to change the value of one of the pointers, expecting value will be changed in other pointer too(since they have same address). But its giving segmentation fault. I am showing it in a code below. #include<stdio.h> #include<string.h> int main() { char * p =

问题 constexpr auto v = static_cast<std::uint64_t>(1) << 32; is not ideal, because of the tedious syntax and the cast which is semantically indirect. From this thread, I learned constexpr auto v = UINT64_C(1) << 32; However, the precise semantics of the macro is expands to an integer constant expression having the value specified by its argument and the type uint_least64_t . Therefore, it's not exactly uint64_t . I'm wondering what is the best/proper way to define uint64_t constants. Note that

问题 I have a simple data set to parse with lines like the following: R1 (a/30) to R2 (b/30), metric 30 The only data that I need from the above is as follows: R1, a, 30, R2, 192.168.0.2, 30, 30 I can parse all of this easily with pyparsing, but I either end up with a bunch of literals in my output, or I have to specifically say Literal(thing).suppress() in my parsing grammar, which gets tiresome. Ideally, I'd like to write a grammar for the above like: Word(alphanums) + '(' + Word(alphanums) + '/