parent-child

问题 I would like to start a child process in NodeJS and save it's output into a variable. The following code gives it to stdout: require("child_process").execSync("echo Hello World", {"stdio": "inherit"}); I have something in mind that is similar to this code: var test; require("child_process").execSync("echo Hello World", {"stdio": "test"}); console.log(test); The value of test was supposed to be Hello World . Which does not work, since "test" is not a valid stdio value. Perhaps this is possible

问题 I would like to start a child process in NodeJS and save it's output into a variable. The following code gives it to stdout: require("child_process").execSync("echo Hello World", {"stdio": "inherit"}); I have something in mind that is similar to this code: var test; require("child_process").execSync("echo Hello World", {"stdio": "test"}); console.log(test); The value of test was supposed to be Hello World . Which does not work, since "test" is not a valid stdio value. Perhaps this is possible

问题 The parent component contains an array of objects. It maps over the array and returns a child component for every object, populating it with the info of that object. Inside each child component there is an input field that I'm hoping will allow the user to update the object, but I can't figure out how to go about doing that. Between the hooks, props, and object immutability, I'm lost conceptually. Here's a simplified version of the parent component: const Parent = () => { const [categories,

来源： https://stackoverflow.com/questions/63310432/angular-how-do-i-access-the-reference-variable-which-is-in-a-ng-template

来源： https://stackoverflow.com/questions/45047559/java-parent-class-is-calling-a-method-from-a-child-class

问题 I'm trying to mass encode video files in x265 and wanted to come up with a batch file that could automate the process. In order to expedite things, I found that having 3 instances of ffmpeg called with 2 threads resulted in ideal encoding times, however I've tried all day yesterday to come up with a way to get a batch file that will call 3 instances and then call new ones when they complete. So far, this is where I am: PARENT BATCH @echo off Setlocal EnableDelayedExpansion SET /A COUNT=0 for

问题 I coworker of mine told me that it was possible to convert a List<BaseClass> to a List<DerivedClass> (they didn't show me a working example). I didn't think it was possible to convert a parent class into a child class (I do know however that it is possible to do it the other way around). I've seen several related questions with people saying it can't be done and people saying it can - none of the proposed solutions have worked for me at all. I always get a: System.InvalidCastException. Unable

问题 I coworker of mine told me that it was possible to convert a List<BaseClass> to a List<DerivedClass> (they didn't show me a working example). I didn't think it was possible to convert a parent class into a child class (I do know however that it is possible to do it the other way around). I've seen several related questions with people saying it can't be done and people saying it can - none of the proposed solutions have worked for me at all. I always get a: System.InvalidCastException. Unable

问题 Let's say I have the following table: child_id parent_id 1 2 2 3 3 - 4 5 5 6 6 - 7 8 and I want to create the following table: child_id parent_id branch_id 1 2 1 2 3 1 3 - 1 4 5 2 5 6 2 6 - 2 7 8 3 in which the branch_id denotes groupings that are linked together by the parent_ids. However, the row order is not guaranteed and branches may contain hundreds of rows . This rules out a simple use of the LAG() function. How can I achieve this given the limitations of BigQuery's SQL? 回答1: Below

问题 I generate child elements from a list, so each child has the same checkboxes. Then I want to create a function that checks the status of my checkboxs (handleChecked) but i get this error Cannot read property 'data' of undefined here is an exemple of my situation : https://codesandbox.io/s/test-uz-713xy 回答1: You can do the below changes. You will be getting the logs printed while toggling the state. You can store the function invariable and than call it as I have demonstrated below import