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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: This question already has an answer here: $('elems').each() with fat arrow 2 answers I have this ES6 code, after I compile it with Babel to ES5 the this inside .each 's call back becomes undefined . How do I fix this problem? let mediaBoxes = $(".now-thumbnail"); let titles = []; mediaBoxes.each(() => { let obj = { index: i, title: $(this).find(".now-thumbnail-bottomtext").text().trim() }; titles.push(obj); }); 回答1: My solution is to not use this at all, but use the variables that are passed to the callback function. The first one is the

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am trying to create a function that will return the 3 points coordinates of arrow head (isoscele triangle) that I want to draw at the end of a line. The challenge is in the orientation (angle) of the line that can vary between 0 and 360 degree in the quadrant. I have the following values: //start coordinates of the line var x0 = 100; var y0 = 100; //end coordinates of the line var x1 = 200; var y1 = 200; //height of the triangle var h = 10; //width of the base of the triangle var w = 30 ; This is my function until now that returns the two

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am writing a location based application for iOS 5. The application is using the CLLocationManager to receive Location updates. When the application is started I am creating the LocationManager, calling [self.locationManager startUpdatingLocation]; and the grey location arrow appears in the statusbar. When the application enters background I am calling [self.locationManager stopUpdatingLocation]; [self.locationManager startMonitoringSignificantLocationChanges]; cause I just want to receive significant location changes while the app is in

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I cannot understand why in the arrow functions we do not need to wrap the literal of arrow function in the ({}) braces, instead of in this example the literal just wrapped in the single () braces. Why? I had surfed the internet to find an answer on it, but it failed. And also why we put the arguments in double braces ({}) , instead of just () ? const FilterLink = ({ filter, children }) => ( <NavLink to={filter === 'SHOW_ALL' ? '/' : `/${ filter }`} activeStyle={ { textDecoration: 'none', color: 'black' }} > {children} </NavLink> ) 回答1: Using

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: So in short i'm simply trying to move a rectangle around a Canvas object in a WPF application. What i have here is my KeyDown event function. The problem is, when i hold a key down for long, it launches this function over and over again rapidly and screws up my rectangle location code. My theory/logic behind it: BECAUSE WHEN YOU HOLD A BUTTON DOWN ON A KEYBOARD IT DOES NOT MOVE SMOOTHLY (TEST IT ON THE SCROLL BAR IN YOUR BROWSER, IT STARTS, pauses, THEN CONTINUES SMOOTHLY), i want it to start a forms timer that moves the object in the UI.

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: When I try to change navigation drawer toggle color, only hamburger changes it, arrow keeps her native color. You can see it here - <style name="AppTheme" parent="Theme.AppCompat.NoActionBar"> <item name="android:windowBackground">@drawable/app_background</item> <item name="android:dropDownListViewStyle">@style/DropDownListViewStyle</item> <item name="colorPrimary">@color/primary</item> <item name="colorPrimaryDark">@color/primary_dark</item> <item name="colorAccent">@color/accent</item> <item name="android:textColor">@color/primary_text<

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: The fat arrow can be used in different settings but it somehow doesn't always bind to the instance I want. 回答1: The fat arrow binds at 3 occasions when declaring a method when declaring a function within a method when declaring a function in global context 1. When declaring a method When the Coffeescript compiler encouters the following syntactical pattern within a class declaration class A somemethod: (paramlist) => This will yield the following code within the constructor of class A this.somemethod = __bind(this.somemethod, this); That is

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm trying to replace the arrow of a select with a picture of my own. I'm including the select in a div with the same size, I set the background of the select as transparent and I'm including a picture(with the same size as the arrow) in the right top corner of the div as background. It only works in Chrome. How can I make it work in Firefox and IE9 where I'm getting this: .styled-select { width: 100px; height: 17px; overflow: hidden; overflow: -moz-hidden-unscrollable; background: url(images/downarrow_blue.png) no-repeat right white; border

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: In ES6, both of these are legal: var chopper = { owner: 'Zed', getOwner: function() { return this.owner; } }; and, as shorthand: var chopper = { owner: 'Zed', getOwner() { return this.owner; } } Is it possible to use the new arrow functions as well? In trying something like var chopper = { owner: 'John', getOwner: => { return this.owner; } }; or var chopper = { owner: 'John', getOwner: => (this.owner) }; I get a error messages suggesting that the method does not have access to this . Is this just a syntax issue, or can you not use fat-pipe

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am using matplotlib.pyplot.annotate to draw an arrow on my plot, like so: import matplotlib.pyplot as plt plt.annotate("",(x,ybottom),(x,ytop),arrowprops=dict(arrowstyle="->")) I want to use an arrow style that has a flat line at one end and an arrow at the other, so combining the styles "|-|" and "->" to make something we might call "|->", but I can't figure out how to define my own style. I thought I might try something like import matplotlib.patches as patches myarrow = patches.ArrowStyle("Fancy", head_length=0.4,head_width=0.2) (which