overwrite

问题 Simple: I want to disable/overwrite alert() . Can I do this? More importantly, is it right to do this? What about strict mode? 回答1: Yes, you can disable or overwrite alert() . No, it's not right to do it, except in some bizarre and limited situations. Disable: window.alert = function() { }; Override: window.alert = function(text) { /* do something */ }; 回答2: Yes you can, it's your choice. You could also store the original 'alert': window.nativeAlert = window.alert; window.alert = function(val

问题 I can't seem to figure out how to write data to a file without overwriting it. I know I can use File.appendtext but I am not sure how to plug that into my syntax. Here is my code: TextWriter tsw = new StreamWriter(@"C:\Hello.txt"); //Writing text to the file. tsw.WriteLine("Hello"); //Close the file. tsw.Close(); I want it to write Hello every time I run the program, not overwrite the previous text file. Thanks for reading this. 回答1: Pass true as the append parameter of the constructor:

问题 I know what overriding is in C++. But, is there overwriting ? If so, what does it mean? Thanks. 回答1: In C++ terminology, you have overriding (relating to virtual methods in a class hierarchy) and overloading (related to a function having the same name but taking different parameters). You also have hiding of names (via explicit declaration of the same name in a nested declarative region or scope). The C++ standard does not use the term "overwrite" except in its canonical English form (that is

问题 Hi I just want to make sure I have these concepts right. Overloading in java means that you can have a constructor or a method with different number of arguments or different data types. i.e public void setValue(){ this.value = 0; } public void setValue(int v){ this.value = v; } How about this method? Would it still be considered overloading since it's returning a different data type? public int setValue(){ return this.value; } Second question is: what is overriding in java? Does it relate to

问题 Currently I'm using this: f = open(filename, 'r+') text = f.read() text = re.sub('foobar', 'bar', text) f.seek(0) f.write(text) f.close() But the problem is that the old file is larger than the new file. So I end up with a new file that has a part of the old file on the end of it. 回答1: If you don't want to close and reopen the file, to avoid race conditions, you could truncate it: f = open(filename, 'r+') text = f.read() text = re.sub('foobar', 'bar', text) f.seek(0) f.write(text) f.truncate(

问题 I am trying to make some sort of encrypt and decrypt program where it takes a letter and turns it into the next letter on the keyboard (like the following) data = data.replace('q', 'w'); data = data.replace('w', 'e'); (data is a string) With this code it turns the 'q' into 'w', but then that same 'w' into an 'e' and I don't want that happening. How would I avoid this? 回答1: This will do the trick: String data = "..."; StringBuilder finalData = new StringBuilder(data.length()); for(int i = 0; i

问题 I have a problem using awk in the terminal. I need to move many files in a group from the actual directory to another one and I have the list of the necessary files in a text file, as: filename.txt file1 file2 file3 ... I usually digit: paste filename.txt | awk '{print "mv "$1" ../dir/"}' | sh and it executes: mv file1 ../dir/ mv file2 ../dir/ mv file3 ../dir/ It usually works, but now the command changes its behaviour and awk overwrites the last string ../dir/ on the first one, starting

问题 This question already exists : Newly created file becomes 0 kb (data gets overwritten to nothing) on reboot in Linux Closed 2 years ago . I've a shell script which create files programmatically by writing the contents of a variable to a file in the memory location. file=/downloads/fileName.crt variable="These contents are to be written to the file" echo "$variable" > "$file" This works fine. I'm able to see that the file is written to and not NULL. But sometimes after running this script and

问题 I am looking for a way to overwrite certain parts in a .dat file with 00000. For this I have a StringBuilder with content like this: "00000000 0000000000000000 " Now I am looking for a method that overwrites the parts in the file with zeroes, and justs keeps the content of the parts with spaces. So if I have "AUEUIGHEVjerhvgm,eiouhegfwoedjkjjjjjjjjjjjjjjje" I want it to turn into "00000000Vjerhvgm,eio0000000000000000jjjjjjjjjje" Does such a method exist? Or should I accomplish this task in

问题 I have a text file that I want to edit by rewriting it to a temp file and then overwrite the original. This code doesn't do that as it's simplified but it does include the problem I have. On Windows the EXAMPLE.TXT file will disappear after a seemly random number of runs when the rename function fails. I don't know why but so far it has worked fine on Linux. Why does this happen and how can I solve it going in an entirety different direction, such as overwriting the original file from within