Javascript debug: Difference between revisions
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== Steps to troubleshooting == | == Steps to troubleshooting == | ||
* Checking the typo or "ensure that there are no compile-time errors"<ref>[https://stackoverflow.com/help/mcve How to create a Minimal, Complete, and Verifiable example - Help Center - Stack Overflow]</ref> by using [https://www.jslint.com/ JSLint] [[Javascript debug#tools | tools]]. | * Checking the typo or "ensure that there are no compile-time errors"<ref>[https://stackoverflow.com/help/mcve How to create a Minimal, Complete, and Verifiable example - Help Center - Stack Overflow]</ref> by using [https://www.jslint.com/ JSLint] [[Javascript debug#tools | tools]]. | ||
* Verify the format of JSON file if the file was used by javascript by using [https://jsonlint.com/ JSONLint - The JSON Validator] tools. | |||
* Disable the browser extension e.g. switch to '''incognito window''' on {{Chrome}} | * Disable the browser extension e.g. switch to '''incognito window''' on {{Chrome}} | ||
* Clear or disable the browser cache | * Clear or disable the browser cache | ||
Revision as of 18:29, 2 October 2018
<< Testing: Javascript
Steps to troubleshooting
- Checking the typo or "ensure that there are no compile-time errors"[1] by using JSLint tools.
- Verify the format of JSON file if the file was used by javascript by using JSONLint - The JSON Validator tools.
- Disable the browser extension e.g. switch to incognito window on Chrome
- Clear or disable the browser cache
- Reload the webpage again
- Switch to different network environment
methods / functions
Print message
- alert() Method: Window alert() Method equivalent: window.alert("some message...");
- Is there an equivalent for var_dump (PHP) in Javascript? - Stack Overflow
- console.log()
- Firefox
: Firebug and Logging : Firebug, 利用Firebug的console功能作JavaScript偵錯 - iT邦幫忙::IT知識分享社群 for Firefox 
not work for the Firebug Lite for Google Chrome(tested version: 1.4.0.11967 ) - Chrome : Using the Console - Chrome Developer Tools — Google Developers Enter the javascript scripts in the console ( after the > symbol) directly.
- IE
v.9: Using the F12 Tools Console to View Errors and Status (Windows) / 使用 F12 工具主控台檢視錯誤和狀態 (Windows) not IE v.8
- Firefox
- Javascript var_dump function | Tsung's Blog
- JSON.stringify()[1] "Convert a JavaScript object into a string" [Last visited: 2017-09-11]
DOM
- 如果是進行 DOM 操作，可以將選定的 DOM 元素標上顏色，確認有選到。 ex: using .addClass() | jQuery API Documentation
Data type
- isNaN() Function, isFinite() Function, typeof variable
Browser tool
- javascript - How do I view events fired on an element in Chrome DevTools? - Stack Overflow on Chrome
Browser cache issue
tools
- The Online Lint
- JSLint,The JavaScript Code Quality Tool
- desktop editor: Sublime Text + package: JSLint[2]
- JS Bin - Collaborative JavaScript Debugging
allow to download
references
Troubleshooting of ...
- PHP, cUrl, Python, selenium, HTTP status code errors
- Database: SQL syntax debug, MySQL errors, MySQLTuner errors or PostgreSQL errors
- HTML/Javascript: Troubleshooting of javascript, XPath
- Software: Mediawiki, Docker, FTP problems, online conference software
- Test connectivity for the web service, Web Ping, Network problem, Web user behavior, Web scrape troubleshooting
Template