object

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 6 years ago . Improve this question As a beginner I wonder why my caller.VelocityC only works when put inside of the main block? When i have my code like this, I can't call the method. Method calling class: public class Velocity2 { VelocityCounter caller = new VelocityCounter(); caller

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 6 years ago . Improve this question As a beginner I wonder why my caller.VelocityC only works when put inside of the main block? When i have my code like this, I can't call the method. Method calling class: public class Velocity2 { VelocityCounter caller = new VelocityCounter(); caller

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 6 years ago . Improve this question As a beginner I wonder why my caller.VelocityC only works when put inside of the main block? When i have my code like this, I can't call the method. Method calling class: public class Velocity2 { VelocityCounter caller = new VelocityCounter(); caller

问题 original object : [ { Name: 'ZoneName', Value: 'Box A', } , { Name: 'AirSide', Value: { JZCleanTipFlowResults: { LeakageAirFlowRate: 2.0519336991674058, LeakageAirFlowRate_Uncertainty: 0.05755421849942835, LeakageAirFlowRate_lbmhr: 16285.188088630204, LeakageAirFlowRate_lbmhr_Uncertainty: 456.779511900225, }, UsedAmbientTemperatureForCombustion: true, SubStoichWarning: false, }, } , { Name: 'FuelSide', Value: { Fuels: { 'Header 0': { CleanTipResults: { HR: 10776333.422366736, HR_Uncertainty:

问题 I am trying to make a formula to output a triangle wave using logic instead of additive Synthesis since using additive Synthesis is more CPU intense. More info can be found here, 'Problems with formula to output a triangle waveform in Java' I have edited the code a bit since then. My problem is that the linear triangle wave generation formula is not precise. It has distortion and is too sharp for higher notes. The method I am having trouble with is liniarTriangle() public class

问题 I tried to use isset() to determine if this property contains something. I run the following checks: First, I determine if $property->property_address contains something: var_dump($property->property_address); // Outputs // string(5) "hello" Now if I try it in isset() : var_dump(isset($property->property_address)); // Outputs // bool(false) Why is that? That is why it won'r proceed on my if-else, because isset returns false. 回答1: Try doing both var_dumps at the same call and check the output

问题 Below is the code am trying the figure out, when arrays (bill, tipValue, totalAmmount) are declared within the object method i get "cannot set property '0' undefined error. But, When the same arrays are declared outside the object then i get expected result" code am getting exception: var john = { bill: [124, 48, 268, 180, 42], tipValue: [], totalAmmount: [], calcTip() { this.bill.forEach(function (ele, i) { this.tipValue[i] = innercalc(ele); this.totalAmmount[i] = this.tipValue[i] + ele; });

问题 Attempting to learn javascript. I am trying to create Table Row data from data in state (being sent to components via Context API): myArr = [ {id: 1, name: AA, desc: DescA, color: red}, {id: 2, name: BB, desc: DescB, color: orange}, {id: 3, name: CC, desc: DescC, color: green}, {id: 4, name: DD, desc: DescD, color: blue}, ] I would like to pull only name and color from each object, and create a new arr of objects. newArr = [ {name: AA, color: red} {name: BB, color: orange} {name: CC, color:

问题 I have a mongo collection which has the following document: { _id: ObjectId("5c7ba3c0e30e6132f8b0c4ef"), replies: [ { _id: ObjectId("5c7ba3c0e30e6132f8b0c4ef"), status: 'rejected' } ] } I want to get all replies with status approved so I make the following query: Collection.find({'replies.status': 'approved'}) and yet the document above appears in the results. What am I doing wrong? 回答1: This is a common misunderstanding of the query process. I suspect one of your docs looks like this: { "_id

问题 I need to create a stored procedure in mysql that take some fields from DB and create a neasted json object: Firstly I create a json object as showing below: { "form": "Exams tests", "version": "v3.001.01", "questions": [] } And secondly a json array object like this: {[ { "ordem": 1, "num_questions": 1, "question1": "How old are you?" "answer1": "I'm 18 years old." } { "ordem": 2, "num_questions": 2, "question1": "How old are you?" "answer1": "I'm 18 years old." "question2": "Where do you