Chrome Devtools Cheatsheet
Opening Devtools
To access the DevTools, on any web page or app in Google Chrome you can use one of these options:
Open the Chrome menu
at the top-right of your browser window, then select Tools & Developer Tools.
Right-click on any page element and select Inspect Element.
Windows / Linux
Open Developer Tools
F12, Ctrl + Shift + I
Cmd + Opt + I
Open / switch from inspect element mode and browser window
Ctrl + Shift + C
Cmd + Shift + C
Open Developer Tools and bring focus to the console
Ctrl + Shift + J
Cmd + Opt + J
Inspect the Inspector (undock first one and press)
Ctrl + Shift + J
Cmd + Opt + J
To open up the General Settings dialog type ? or F1 when the Developer Tools window is open. Press Esc to close the settings dialog.
All Panels
Windows / Linux
Show General Settings dialog
Next panel
Previous panel
Backward in panel History
Ctrl + Alt + [
Cmd + Alt + [
Forward in panel history
Ctrl + Alt + ]
Cmd + Alt + ]
Jump to panel 1-9 (when enabled in General Settings)
Ctrl + 1-9
Toggle Console / close settings dialog when open
Refresh the page
F5, Ctrl + R
Refresh the page ignoring cached content
Ctrl + F5, Ctrl + Shift + R
Cmd + Shift + R
Text search within current file or panel
Text search across all sources
Ctrl + Shift + F
Cmd + Alt + F
Search by filename (except on Timeline)
Ctrl + O, Ctrl + O
Cmd + O, Cmd + O
Restore default text size
Elements Panel
Windows / Linux
Undo change
Redo change
Cmd + Y, Cmd + Shift + Z
Expand / collapse node
Right, Left
Right, Left
Expand node
Single-click on tag
Single-click on tag
Edit attribute
Enter, Double-click on attribute
Enter, Double-click on attribute
Hide element
Toggle edit as HTML
Right-clicking an element you can:
Force element psuedo states: (:active, :hover, :focus, :visited)
Set breakpoints on the elements: (Subtree modifications, Attribute modification, Node removal)
Clear console
Styles Sidebar
Windows / Linux
Single-click
Single-click
Insert new property
Single-click on whitespace
Single-click on whitespace
Go to line of style rule property declaration in source
Ctrl + Click on property
Cmd + Click on property
Go to line of property value declaration in source
Ctrl + Click on property value
Cmd + Click on property value
Go to line of style rule property declaration in source
Ctrl + Click on property
Cmd + Click on property
Go to line of property value declaration in source
Ctrl + Click on property value
Cmd + Click on property value
Cycle through the color definition value
Shift + Click on color picker box
Shift + Click on color picker box
View auto-complete suggestions
Ctrl + Space
Cmd + Space
Edit next / previous property
Tab, Shift + Tab
Tab, Shift + Tab
Increment / decrement value
Increment / decrement value by 10
Shift + Up, Shift + Down
Shift + Up, Shift + Down
Increment / decrement value by 10
PgUp, PgDown
PgUp, PgDown
Increment / decrement value by 100
Shift + PgUp, Shift + PgDown
Shift + PgUp, Shift + PgDown
Increment / decrement value by 0.1
Alt + Up, Alt + Down
Opt + Up, Opt + Down
Emulate an element's pseudo state (:active, :hover, :focus, :visited)
Add new style selectors
Network Panel
Understanding the information displayed within each column
Size: Total size of resource
Content: Gzipped size of resource
Time: total duration to get response
Latency: time taken to get first byte
File that initialized the resource load
How the resource load was scheduled
Export network data into
Sources Panel
Windows / Linux
Pause / resume script execution
F8, Ctrl + \
F8, Cmd + \
Step over next function call
F10, Ctrl + '
F10, Cmd + '
Step into next function call
F11, Ctrl + ;
F11, Cmd + ;
Step out of current function
Shift + F11, Ctrl + Shift + ;
Shift + F11, Cmd + Shift + ;
Select next call frame
Select previous call frame
Toggle breakpoint condition
Click on line number, Ctrl + B
Click on line number, Cmd + B
Edit breakpoint condition
Right-click on line number
Right-click on line number
Delete individual words
Alt + Delete
Opt + Delete
Comment a line or selected text
Save changes to local modifications
Go to line
Search by filename
Jump to line number
Ctrl + P + :&number&
Cmd + P + :&number&
Jump to column
Ctrl + O + :&number& + :&number&
Cmd + O + :&number& + :&number&
Go to member
Ctrl + Shift + O
Cmd + Shift + O
Toggle console and evaluate code selected in Sources panel
Ctrl + Shift + E
Cmd + Shift + E
Run snippet
Ctrl + Enter
Cmd + Enter
Toggle comment
Don't pause on exceptions
Pause on All exceptions (including those caught within try/catch blocks)
Pause on uncaught exceptions (usually the one you want)
Profiles Panel
Windows / Linux
Start / stop recording
Profiling types:
: shows where execution time is spent in your page's JavaScript functions
: shows memory distribution by your page's JavaScript objects and related DOM nodes
Windows / Linux
Next suggestion
Previous suggestion
Shift + Tab
Shift + Tab
Accept suggestion
Previous command / line
Next command / line
Clear Console
Cmd + K, Opt + L
Multi-line entry
Shift + Enter
Ctrl + Return
Right-clicking on console:
XMLHTTPRequest logging: Turn on to view the XHR log
Preserve log upon navigation
Filter: Hide and unhide messages from script files
Clear console: Clear all console messages
Screencasting
Windows / Linux
Pinch zoom in and out
Alt + Scroll,Ctrl + Cick and drag with two fingers
Opt + Scroll, Cmd + Cick and drag with two fingers
Inspect element tool
Ctrl + Shift + C
Cmd + Shift + C
Windows / Linux
Pinch zoom in and out
Shift + Scroll
Shift + Scroll
Console API
Description
console.assert(expression[, object, ...])
Tests that an expression is true. If not, it will write a message to the console and throw an exception.
console.clear()
Clears the console.
console.constructor()
console.count([title])
Writes the number of times that the line of code where count was called was executed. The optional argument title will print a message in addition to the number of the count.
console.debug(object[, object, ...])
Writes a message to the console, including a hyperlink to the line where it was called.
console.dir(object)
Prints an interactive listing of all properties of the object. This looks identical to the view that you would see in the DOM tab.
console.dirxml(node)
Prints the XML source tree of an HTML or XML element. This looks identical to the view that you would see in the HTML tab. You can click on any node to inspect it in the HTML tab.
console.error(object[, object, ...])
Writes a message to the console with the visual "error" icon and color coding and a hyperlink to the line where it was called.
console.exception(error-object[, object, ...])
Prints an error message together with an interactive stack trace of JavaScript execution at the point where the exception occurred.
console.group(object[, object, ...])
Writes a message to the console and opens a nested block to indent all future messages sent to the console. Call console.groupEnd() to close the block.
console.groupCollapsed(object[, object, ...])
Like console.group(), but block is initially collapsed.
console.groupEnd()
Closes the most recently opened block created by a call to console.group() or console.groupCollapsed().
console.hasOwnProperty()
(object[, object, ...])
Writes a message to the console with the visual "info" icon and color coding and a hyperlink to the line where it was called.
console.isPrototypeOf()
console.keys()
Gives you the names of all the elements of an object.
console.log(object[, object, ...])
Writes a message to the console. You may pass as many arguments as you'd like, and they will be joined together in a space-delimited line. You can use printf-like string substitution patterns as well which are:
String: %s -
console.log('The %s is a %s', animal, cat);
Integer: %d, %i -
console.log('Number %d plus %i', 1, 2);
*integer not yet supported
Floating point number: %f -
console.log('Floating points: %f', 1.5);
*numeric formatting not yet supported
Hyperlink: %o -
console.log('Live laugh code at $o', '' );
Style formatting: %c -
console.log('%c This is white text on a black background', 'color:#background:#000;');
console.memory
An object that returns: jsHeapSizeLimit, totalJSHeapSize, usedJSHeapSize
console.profile([title])
Turns on the JavaScript profiler. The optional argument title would contain the text to be printed in the header of the profile report.
console.profileEnd()
Turns off the JavaScript profiler and prints its report.
console.profiles
An array of profile objects that summarizes the data from profile().
console.propertyIsEnumerable()
console.table(data[, columns])
Allows to log provided data using tabular layout. The method takes one required parameter that represents table like data (array of arrays or list of objects).
console.time([name])
Creates a new timer under the given name. Call console.timeEnd(name) with the same name to stop the timer and print the time elapsed.
console.timeEnd()
Stops a timer created by a call to console.time(name) and writes the time elapsed.
console.timeStamp()
console.toLocaleString()
console.toString()
console.trace()
Prints an interactive stack trace of JavaScript execution at the point where it is called.
console.values()
Gives you all the values of those elements.
console.warn(object[, object, ...])
Writes a message to the console with the visual "warning" icon and color coding and a hyperlink to the line where it was called.
console.valueOf()
window.onerror
When exceptions are thrown in the window context and is not caught by any try/catch block, the function will be invoked with the exception's message, the URL of the file where the exception was thrown and the line number in that file passed as three arguments in that order.
window.onerror = function(msg, url, line) {
console.log('message: ' + msg, 'url: ' + url, 'line: ' + line);
Command Line API
Description
Returns an array of elements that match the given CSS selector.
The currently-selected object in the inspector.
The previously evaluated statement
The previously-selected object in the inspector.
Access to an array of last 5 inspected elements.
dir(object)
Prints an interactive listing of all properties of the object. This looks identical to the view that you would see in the DOM tab.
dirxml(node)
Prints the XML source tree of an HTML or XML element. This looks identical to the view that you would see in the HTML tab. You can click on any node to inspect it in the HTML tab.
Clears the console.
Copies everything passed to it to the clipboard.
inspect(object[, tabName])
Inspects an object in the most suitable tab, or the tab identified by the optional argument tabName.
keys(object)
Returns an array containing the names of all properties of the object.
values(object)
Returns an array containing the values of all properties of the object.
monitorEvents(object[, types])
Turns on logging for all events dispatched to an object. The optional argument types may specify a specific family of events to log. The most commonly used values for types are "mouse" and "key". The full list of available types includes "composition", "contextmenu", "drag", "focus", "form", "key", "load", "mouse", "mutation", "paint", "scroll", "text", "ui", and "xul".
unmonitorEvents(object[, types])
Turns off logging for all events dispatched to an object.
performance
performance.timing
performance.memory
performance.navigation
profile([title])
Turns on the JavaScript profiler. The optional argument title would contain the text to be printed in the header of the profile report.
profileEnd()
Turns off the JavaScript profiler and prints its report.
Description
-disable-javascript
Disable JavaScript from command line.
-disable-images
Disable images.
-disable-java
Disable Java.
-disable-plugins
Disable plugins.
-disable-popup-blocking
Disable popup blocking.
-start-maximized
Start Chrome fullscreen
For example:
"C:\Documents and Settings\%username%\Local Settings\Application Data\Google\Chrome" -disable-javascript
DevTools Themes
Tweak your skin for the DevTools using the DevTools themselves by undocking them then hitting
Ctrl + Alt + I
? + Alt + I
Override the classes/IDs of Devtools for your theme via:
Windows: C:/Users/%username%/AppData/Local/Google/Chrome/User Data/Default/User StyleSheets/Custom.css
Mac OSX: ~/Library/Application Support/Google/Chrome/Default/User StyleSheets/Custom.css
Ubuntu: ~/.config/chromium/Default/User StyleSheets/Custom.css
Read about how to .
Other Chrome Shortcuts
Here are some additional Chrome shortcuts which are useful for general use within the browser not specific to the DevTools.
for Windows, Mac, and Linux.
Windows / Linux
Find previous
Ctrl + Shift + G
Cmd + Shift + G
Open a new window in Incognito mode
Ctrl + Shift + N
Cmd + Shift + N
Toggle Bookmarks bar on and off
Ctrl + Shift + B
Cmd + Shift + B
View the History page
View the Downloads page
Cmd + Shift + J
View the Task Manager
Shift + ESC
Shift + ESC
Next page in a tabs browsing history
Alt + Right
Alt + Right
Previous page in a tabs browsing history
Backspace, Alt + Left
Backspace, Alt + Left
Highlight content in the web address area
F6, Ctrl + L, Alt + D
Cmd + L, Alt + D
Places a ? in the address bar for performing a keyword
search using your default search engine
Ctrl + K, Ctrl + E
Cmd + K, Cmd + E
For a list of all Chrome shortcuts for Windows, Mac, and Linux check out
about:pages
Description
about:about
Displays all the chrome://chrome-urls
about:stats
Display page statistics.
about:memory
Display memory usage in a multi-process browser.
about:plugins
Display installed plug-ins.
about:histograms
Display connection times.
Display DNS information.
about:cache
Display cached web pages.
about:network
Display a menu for various network monitoring and testing.
view-cache:stats
Display cached documents.
chrome-resource:/favicon/
Display the binary data for a PNG file.
chrome-resource:/new-tab/
A template for the empty tab page.
about:version
Display information about the browser.
Chrome URLs
chrome://chrome-urls == about:about
chrome://appcache-internals
chrome://blob-internals
chrome://bookmarks
chrome://cache
chrome://crashes
chrome://credits
chrome://dns
chrome://downloads
chrome://extensions
chrome://flags
chrome://flash
chrome://gpu-internals
chrome://histograms
chrome://history
chrome://ipc
chrome://media-internals
chrome://memory
chrome://net-internals
chrome://view-http-cache
chrome://newtab
chrome://plugins
chrome://print
chrome://quota-internals
chrome://sessions
chrome://starts
chrome://sync-internals
chrome://tcmalloc
chrome://terms
chrome://tracing
chrome://version
chrome://workers
chrome://conflicts
For Debugging
The following pages are for debugging purposes only. Because they crash or hang the renderer, they're you can type them into the address bar if you need them
chrome://crash
chrome://kill
chrome://hang
chrome://shorthang
chrome://gpuclean
chrome://gpucrash
chrome://gpuhang
Devtools Links
This work is licensed under a .
Cheatsheet by . Notify me if you find something that is incorrect.发者（KaiFaX）面向开发者、程序员的专业平台！前言：调试技能，在任何一项技术研发中都可谓是必不成少的技术。把握各类调试技能，一定能在工作中起到事半功倍的结果。比方，快速定位题目、下降故障几率、帮助分析逻辑毛病等等。而在互联网前端开辟越来越重要的明天，若何在前端开辟中下降开辟本钱，提升工作效力，把握前端开辟调试技能尤其重要。本文将逐一讲授各类前端JS调试技能，也许你已经熟练把握，那让我们一路来温习，也许有你没见过的方式，无妨一路来进修，也许你尚不知若何调试，赶紧趁此机遇填补空缺。骨灰级调试大师Alert那还是互联网刚刚起步的时代，网页前端还首要之内容展现为主，阅读器剧本还只能为页面供给很是简单的帮助功用的时辰。阿谁时辰，网页首要运转在以IE6为主的阅读器中，JS的调试功用还很是弱，只能经过内置于Window工具中的alert方式来调试，那时辰看起来应当是这个样子：&需要说明一点，这里看到的结果，并非昔时的IE阅读器中看到的结果，而是在高版本IE中的结果。此外，昔时貌似还没有这么高级的控制台，而alert的利用也是在实在的页面JS代码中。虽然，alert的调试方式很原始，但那时确切有它不成磨灭的代价，甚至到明天，已然有其用武之地。新一代调试王者Console随着JS在Web前端中能做的工作越来越多，义务越来越大，而职位也越来越重要。传统的alert调试方式已经渐渐不能满足前端开辟的各种场景。而且alert调试方式弹出的调试信息，阿谁窗口实在不太美妙，而且会遮挡部分页面内容，实在有些不太友爱。另一方面，alert的调试信息，必须在法式逻辑中增加类似”alert(xxxxx)”这样的语句，才能一般工作，而且alert会障碍页面的继续衬着。这就意味着开辟职员调试完成后，必须手动断根这些调试代码，实在有些麻烦。所以，新一代的阅读器Firefox、Chrome，包括IE，都相继推出了JS调试控制台，支持利用类似”console.log(xxxx)”的形式，在控制台打印调试信息，而不间接影响页面显现。以IE为例，它看起来像这样：好吧，再会丑陋的alert弹出框。而以Chrome阅读器为首的后起之秀，为Console扩大了更丰富的功用：&你以为这样就满足了？Chrome开辟团队的设想力实在不能不让人佩服：好了，稍微多说了一点点题外话。总之，控制台以及阅读器内置Console工具的出现，给前端开辟调试带来了极大的便当。有人会问，这样的调试代码纷歧样需要在调试完成落后行清算吗？关于这个题目，假如在利用console工具之前先辈性存在性考证，实在不删除也不会对营业逻辑形成破坏。固然，为了代码整洁，在调试完成后，还是应尽能够删除这些与营业逻辑无关的调试代码。JS断点调试断点，调试器的功用之一，可以让法式中断在需要的地方，从而方便其分析。也可以在一次调试中设备断点，下一次只需让法式自动运转到设备断点位置，即可在上次设备断点的位置中断下来，极大的方便了操纵，同时节省了时候。——百度百科JS断点调试，即是在阅读器开辟者工具中为JS代码增加断点，让JS履行到某一特定位置停住，方便开辟者对该处代码段的分析与逻辑处置。为了可以观察到断点调试的结果，我们预先随意预备一段JS代码：&代码很简单，就是界说一个函数，传入两个数，别离加上一个整齐不齐的随机整数后，再返回两个数的总和。以Chrome开辟者工具为例，我们来看一下JS断点调试的根基方式。Sources断点首先，测试代码中我们经过上图console的输出成果可以看出代码应当是一般运转了，可是为什么是应当呢？由于函数中加了一个随机数，而终极成果能否真的是正确的呢？这是毫无意义的料想，可是假定我现在就是要考证一下：函数传入的两个数、被加的随机数，以及终极的总和。那末该怎样操纵呢？方式一，前面讲过最普通的，不管利用alert还是console，我们可以这么来考证：&从上图发现，我们在代码中新增了三行console代码，用以打印我们关心的数据变量，而终极我们从控制台（Console面板）中的输出成果，可以很清楚的考证全部计较进程能否一般，进而到达我们题设的考证要求。方式二，方式一的考证进程存在很明显的弊端就是，增加了很多冗余代码，接下来我们看一下利用断点停止考证，能否加倍方便，先看一个若何加断点，以及断点后是什么结果：&如图，给一段代码增加断点的流程是“F12（Ctrl + Shift + I）翻开开辟工具”——“点击Sources菜单”——“左侧树中找到响应文件”——“点击行号列”即完成在当前行增加/删除断点操纵。当断点增加终了后，革新页面JS履行到断点位置停住，在Sources界面会看到当前感化域中一切变量和值，只需对每个值停止考证即可完成我们题设考证要求。那题目来了，仔细的朋友会发现当我的代码履行到断点的时辰，显现的变量a和b的值是已经停止过加法运算后的，我们看不到挪用sum函数时初始传入的10和20。那末该怎样办呢？这就要回过甚来先进修一下断点调试的一些根本常识了。我们翻开Sources面板后实在会在界面中看到以下内容，我们随着鼠标轨迹逐一看看都是什么意义：从左到右，各个图标暗示的功用别离为：Pause/Resume script execution：停息/规复剧本履行（法式履行到下一断点停止）。Step over next function call：履行到下一步的函数挪用（跳到下一行）。Step into next function call：进入当前函数。Step out of current function：跳出当前履行函数。Deactive/Active all breakpoints：封闭/开启一切断点（不会取消）。Pause on exceptions：异常情况自动断点设备。到此，断点调试的功用键先容得差不多了，接下来我们便可以一行一行去看我们的法式代码，检察每一行履行终了以后，我们各个变量的变化情况了，以下图所示：如上，我们可以看到a、b变量从最初值，到中心加上随机值，再到最初计较总和并输出终极成果的全部进程，完成题设考证要求不在话下。其他几个功用键，我们稍微修改一下我们的测试代码，用一张gif图来演示他们的利用方式：&这里需要留意一点，间接在代码区打印变量值的功用是在较新版本的Chrome阅读器中才新增的功用，假如你还在利用较老版本的Chrome阅读器，能够没法间接在断点的情况下检察变量信息，此时你可以将鼠标移动到变量名上长久搁浅则会出现变量值。也可以用鼠标选中变量称号，然后右键“Add to watch”在Watch面板检察，此方式一样适用于表达式。此外，你还可以在断点情况下，切换到Console面板，间接在控制台输入变量称号，回车检察变量信息。该部分比力简单，斟酌篇幅题目，不在做图演示。Debugger断点所谓的Debugger断点，实在是我自己给它命名的，专业术语我也不晓得怎样说。具体的说就是经过在代码中增加””语句，今世码履行到该语句的时辰就会自动断点。接下去的操纵就跟在Sources面板增加断点调试几近如出一辙，唯一的区分在于调试完后需要删除该语句。既然除了设备断点的方式纷歧样，功用和Sources面板增加断点结果一样，那末为什么还会存在这类方式呢？我想缘由应当是这样的：我们在开辟中偶然会碰到异步加载html片断（包括内嵌JS代码）的情况，而这部分JS代码在Sources树种没法找到，是以没法间接在开辟工具中间接增加断点，那末假如想给异步加载的剧本增加断点，此时””就发挥感化了。我们间接经过gif图看看他的结果：&DOM断点调试DOM断点，望文生义就是在DOM元素上增加断点，进而到达调试的目标。而在现实利用中断点的结果终极还是落地到JS逻辑之内。我们依次来看一下每一种DOM断点的具体结果。当节点内部子节点变化时断点（Break on subtree modifications）在前端开辟越来越复杂的明天，前端JS代码越来越多，逻辑越来越复杂，一个看似简单的Web页面，凡是陪伴着大段大段的JS代码，触及诸多DOM节点增、删、改的操纵。难免碰到间接经过JS代码很难定位代码段的情况，而我们却可以经过开辟者工具的Elements面板，快速定位到相关DOM节点，这时辰经过DOM断点定位剧本就显得特别重要了。具体我们还是经过gif演示来看一下吧：&上图演示了对ul子节点（li）的增加、删除以及交换顺序操纵触发断点的结果。但需要留意的是，对子节点停止属性点窜和内容点窜并不会触发断点。当节点属性发生变化时断点（Break on attributes modifications）另一方面，由于前端处置的营业逻辑越来越复杂，对一些数据的存储依靠越来越激烈，而将姑且数据存储于DOM节点的（自界说）属性中，是很多情况下开辟者优先挑选的方式。出格是在HTML5标准增强自界说属性支持（例：dataset、data-*之类）以后，属性设备利用越来越多，是以Chrome开辟者工具也供给了属性变化断点支持，其结果大致以下：&此方式一样需要留意，对子节点的属性停止任何操纵也不会触发节点自己的断点。当节点被移除时断点（Break on node removal）这个DOM断点设备很简单，触发方式很明白——当节点被删除时。所以凡是情况应当是在履行”parentNode.removeChild(childNode)”语句的时辰利用此方式。此方式利用不多。前面先容到的根基上是我们在平常开辟中经常用到的调试手段，应用适当它们也几近能应对我们平常开辟中的几近一切题目。可是，开辟者工具还斟酌到了更多的情况，供给更多的断点方式，如图：&XHR Breakpoints这几年前端开辟发生了天翻地覆的变化，从当初的名不见经传到现在的每况愈下，Ajax驱动Web富利用，移动WebApp单页利用风生水起。这一切都离不开XMLHttpRequest工具，而“XHR Breakpoints”正是专为异步而生的断点调试功用。&我们可以经过“XHR Breakpoints”右侧的“+”号为异步断点增加断点条件，当异步请求触发时的URL满足此条件，JS逻辑则会自动发生断点。演示动画中并没有演示到断点位置，这是由于，演示利用的是jQuery封装好的ajax方式，代码已经过紧缩，看不到什么结果，而究竟上XHR断点的发生位置是”xhr.send”语句。XHR断点的强大之处是可以自界说断点法则，这就意味着我们可以针对某一批、某一个，甚至一切异步请求停止断点设备，很是强大。可是，似乎这个功用在平常开辟中用得并不多，最少我用得不多。想想缘由大要有两点：其一，这范例的断点调试需求在平常营业中自己触及不多；其二，现阶段的前端开辟大多基于JS框架停止，最根基的jQuery也已经对Ajax停止了杰出封装，少少有人自己封装Ajax方式，而项目为了削减代码体积，凡是挑选紧缩后的代码库，使得XHR断点跟踪相对不那末轻易了。Event Listener Breakpoints事务监听器断点，即按照事务称号停止断点设备。当事务被触发时，断点到事务绑定的位置。事务监听器断点，列出了一切页面及剧本事务，包括：鼠标、键盘、动画、按时器、XHR等等。极大的下降了事务方面营业逻辑的调试难度。&演示实例演示了当click事务被触发时和当setTimeout被设备时的断点结果。实例显现，被选中click事务断点以后，两个按钮的被点击时都触发了断点，而当setTimeout被设备时，“Set Timer”断点被触发。调试，是在项目开辟中很是重要的环节，不但可以帮助我们快速定位题目，还能节省我们的开辟时候。熟练把握各类调试手段，定当为你的职业成长带来诸多好处，可是，在如此多的调试手段中，若何挑选一个合适自己当前利用处景的，这需要经历，需要不竭尝试堆集。来源：原文：http://seejs.me//【原创】一探前端开发中的JS调试技巧/如有侵权或不周之处，敬请劳烦联系若飞（微信：）马上删除，谢谢！1. 回复“m”可以查看历史记录；2. 回复“h”或者“帮助”，查看帮助；&&&&& 开发者已开通多个微信群交流学习，请加若飞微信： 进群开发者：KaiFaX面向开发者、程序员的专业平台！开发者(kaifax)　
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