if-statement

问题 i'm trying to throw together a simple javascript page with multiple if statements. the idea is to append to a list based on the evaluation of a stack of if statements. the problem is if any one of them fails, it triggers the else statement. i only want it to trigger else in the case that all of them fail. <p id="fruit">My fruit basket has: </p> if (apples) { document.getElementById("fruit").innerHTML += "apples"; } if (oranges) { document.getElementById("fruit").innerHTML += "oranges"; } if

问题 I've been trying to change the image in a picture box. It works if I want to change it with one image, but I can't get it to change to the other image. It should alternate between the two images when I click the button. Here is my code: Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim num As Boolean If num = False Then PictureBox3.Image = My.Resources.Beep num = True Else PictureBox3.Image = My.Resources.Skateboard num = False End

问题 I'm trying to execute a simple if else statement in a Makefile: check: if [ -z "$(APP_NAME)" ]; then \ echo "Empty" \ else \ echo "Not empty" \ fi When I execute make check I get the following error: if [ -z "" ]; then /bin/bash: -c: line 1: syntax error: unexpected end of file make: *** [check] Error 2 Any idea what I'm doing wrong? I know I can use the following, but I have a lot of logic after the echos so I need to spread it out across multiple lines: check: [ -z "$(PATH)" ] && echo

问题 Firstly apologises for the length of code but I wanted to show it all. I have an interface that looks like this: When I change the third Option Menu to "List" I will add in the option to have 'n' values (not shown). I then require 'n' columns where the user can input their values. I also have the problem where there may be 'n' amount of rows depending on a text file opened by the interface. I am therefore wondering if it possible (as I'm having difficulties not repeating the same values in

问题 I'm using scrapy to build a spider to monitor prices on a website. The website isn't consistent in how it displays it's prices. For it's standard price, it always uses the same CSS class, however when a product goes on promotion, it uses one of two CSS classes. The CSS selectors for both are below: response.css('span.price-num:last-child::text').extract_first() response.css('.product-highlight-label') Below is how my items currently look within my spider: item = ScraperItem() item['model'] =

问题 A - I have a list containing igraph graph objects: goodgg [[1]] IGRAPH UN-- 3 3 -- + attr: name (v/c), color (v/c), value (e/n), sourceID (e/n), targetID (e/n) + edges (vertex names): [1] 89315--89316 89315--89928 89316--89928 [[2]] IGRAPH UN-- 3 2 -- + attr: name (v/c), color (v/c), value (e/n), sourceID (e/n), targetID (e/n) + edges (vertex names): [1] 106277--106278 106278--106279 I can combine these into a single object using [union][1] : combine = graph.union(goodgg[[1]], goodgg[[2]],

问题 I have created a Risk Log in Excel, there are two columns, labels Priority & Impact (where High (H), Medium (M) or Low (L) can be inputted). I would like to create a third column called "Measure". This will calculate a value based on the priority and the impact of these risks. The numbers are shown in the table below, where the horizontal axis is Impact, and the Vertical in Priority H 3 7 9 M 2 5 8 L 1 4 6 L M H Impact So for example, a priority of H and an impact of H would give you 9 in the

问题 Im having some trouble with using the if else construct in sql triggers in MySQL. The tables below are just used for testing. First Table: CREATE TABLE `test2`.`t1` ( `c1` VARCHAR(5) NOT NULL, `c2` VARCHAR(45) NULL, `c3` VARCHAR(45) NULL, PRIMARY KEY (`c1`)); My second table: CREATE TABLE `test2`.`t2` ( `cc1` VARCHAR(5) NOT NULL, `cc2` VARCHAR(45) NULL, `cc3` VARCHAR(45) NULL, PRIMARY KEY (`cc1`)); and the third: CREATE TABLE `test`.`t3` ( `ccc1` VARCHAR(5) NOT NULL, `ccc2` VARCHAR(45) NULL,

问题 I need help with an "IF" formula in excel using multiple conditions. This is what I need: IF (cell) is <201, then *$2, if (cell) is 201-400, then *$1.15, if (cell) is >400, then *$1) I am trying to create a "settlement" spreadsheet. 回答1: You may try this: =IF(A1<201,"2",IF(AND(A1>201,A1<400),"1.15",1)) However, you've not mentioned what do you want to do when cell value is 201. If you want it to result in $2 then change formula to A1<=201 or else if you want it to result in $1.15 then write

问题 In a particular if-else , I have to identify if a given value falls within a range. The condition part looks like this: else if (a==2 && b.equalsIgnoreCase("line") && <<Here I need to search if c falls within a range>> && d) where a is int, b is string, c is int and d is a boolean. Now if c falls within 1 to 8, the condition is true, else it is false. How can I do that? 回答1: I think you need you this condition for c (c > 1 && c < 8) // 1 and 8 are exclusive (c => 1 && c <= 8) // 1 and 8 are