Top 10 JavaScript errors
Top 10 JavaScript errors
javascript errors
https://rollbar.com/blog/tags/top-errors
https://rollbar.com/blog/top-10-javascript-errors/
TypeError
RangeError
ReferenceError
SyntaxError
InternalError
URIError
Warning
EvalError
JavaScript Errors
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error
Uncaught TypeError: Cannot read property '...' of undefined
var foo;
foo.getName();
// Uncaught TypeError: Cannot read property 'getName' of undefined
foo.name;
// Uncaught TypeError: Cannot read property 'name' of undefined
Uncaught TypeError: Cannot read property 'length' of null
var obj = null;
obj.length;
// Uncaught TypeError: Cannot read property '...' of null
undefined == null;
//true
undefined === null;
//false
CORS script error
// .htaccess
// Access-Control-Allow-Origin
// crossorigin="anonymous"
Uncaught TypeError: ... is not a function
var foo;
this.foo();
// Uncaught TypeError: this.foo is not a function
foo();
// Uncaught TypeError: foo is not a function
this & context error
The reason is that the anonymous function being executed is in the context of the document, whereas
clearBoard
is defined on the window.
function clearBoard(){
alert("Cleared");
}
document.addEventListener("click", function(){
console.log(`this`, this);
// this === #document
this.clearBoard();
});
window.addEventListener("click", function(){
console.log(`this`, this);
// this === Window
this.clearBoard();
});
bind
var that = this;
var self = this;
// save reference to 'this', while it's still this!
document.addEventListener("click", function(){
self.clearBoard();
// that.clearBoard();
});
/ /Alternatively, in the newer browsers, you can use the bind() method to pass the proper reference:
document.addEventListener("click", this.clearBoard.bind(this));
Uncaught RangeError
Number.toExponential(digits)
accept digits from 0 to 100
Number.toFixed(digits)
accept digits from 0 to 100
Number.toPrecision(digits)
accepts digits from 1 to 100.
new Array(-1);
// Uncaught RangeError: Invalid array length
var num = 2;
num.toExponential(-2);
// Uncaught RangeError: toExponential() argument must be between 0 and 100 at Number.toExponential
// num.toFixed(101);
// Uncaught RangeError: toFixed() digits argument must be between 0 and 100 at Number.toFixed
num.toPrecision(0);
// Uncaught RangeError: toPrecision() argument must be between 1 and 100 at Number.toPrecision
Number
Number.MAX_VALUE;
// 1.7976931348623157e+308
Number.MAX_VALUE + Number.MAX_VALUE;
// Infinity
Number.parseFloat(Infinity);
// Infinity
Number.MIN_VALUE;
// 5e-324
Number.MAX_SAFE_INTEGER;
// 9007199254740991
Number.MIN_SAFE_INTEGER;
// -9007199254740991
function local params empty bug
function 形参,实参
var testArray= ["Test"];
function testFunction(testArray) {
for (var i = 0; i < testArray.length; i++) {
console.log(testArray[i]);
}
}
testFunction();
Uncaught TypeError: Cannot set property '...' of undefined
var foo;
foo.name = foo;
// Uncaught TypeError: Cannot set property 'name' of undefined
Uncaught ReferenceError: ... is not defined
xyz;
// Uncaught ReferenceError: xyz is not defined
Errors on the world’s top 100 websites and how to avoid them
https://rollbar.com/blog/top-100-websites-errors/
HTTP error
TypeScript
- JavaScript that scales.
- TypeScript is a typed superset of JavaScript that compiles to plain JavaScript.
- Any browser. Any host. Any OS. Open source.
https://www.typescriptlang.org/
refs
https://rollbar.com/error-tracking/javascript/
xgqfrms 2012-2020
www.cnblogs.com 发布文章使用:只允许注册用户才可以访问!
Top 10 JavaScript errors的更多相关文章
- The Top 10 Javascript MVC Frameworks Reviewed
Over the last several months I have been in a constant search for the perfect javascript MVC framewo ...
- Top 10 JavaScript编辑器,你在用哪个?
对于JavaScript程序员来说,目前有很多很棒的工具可供选择.文本将会讨论10个优秀的支持JavaScript,HTML5和CSS开发,并且可以使用Markdown进行文档编写的文本编辑器.为什么 ...
- GitHub上最流行的Top 10 JavaScript项目
统计出Github中所有项目的数量,几乎是不可能的,而明确指出哪些是最优秀的项目就更不可能了.如果说到JavaScript,曾经极富创新的项目(很可能)在一两个月后就会变得过时.落后.以防被淹没在大量 ...
- Top 10 Javascript MVC 框架
在网上偶然看到了,几种MVC框架各有优缺点,但Backbone和Ember的呼声相对更高-大家参考一下哈- http://codebrief.com/2012/01/the-top-10-javasc ...
- OWASP Top 10 – 2013, 最新十大安全隐患(ASP.NET解决方法)
OWASP(开放Web软体安全项目- Open Web Application Security Project)是一个开放社群.非营利性组织,目前全球有130个分会近万名会员,其主要目标是研议协助解 ...
- [转]Top 10 DTrace scripts for Mac OS X
org link: http://dtrace.org/blogs/brendan/2011/10/10/top-10-dtrace-scripts-for-mac-os-x/ Top 10 DTra ...
- ASP.NET Core中的OWASP Top 10 十大风险-失效的访问控制与Session管理
不定时更新翻译系列,此系列更新毫无时间规律,文笔菜翻译菜求各位看官老爷们轻喷,如觉得我翻译有问题请挪步原博客地址 本博文翻译自: https://dotnetcoretutorials.com/201 ...
- OWASP TOP 10 2017中文译文
说明:owasp top 10其实有中文官方版本:本文是按着英文版进行翻译而成. 官方中文版:http://www.owasp.org.cn/owasp-project/OWASPTop102017v ...
- SQL Server: Top 10 Secrets of a SQL Server Expert
转载自:http://technet.microsoft.com/en-us/magazine/gg299551.aspx Many companies have downsized their IT ...
随机推荐
- Spring整合SpringMVC + Mybatis基础框架的配置文件
目录 前言 1. Mybatis层编写 2. Spring层编写 1. Spring整合Mybatis 2. Spring整合service 3. SpringMVC层编写 1. 编写web.xml ...
- POSTGIS
https://blog.csdn.net/qq_35732147/article/details/85256640 官方文档:http://www.postgis.net/docs/ST_Buffe ...
- Spring Maven配置
看的似懂非懂 https://www.cnblogs.com/webyyq/p/8799727.html https://blog.csdn.net/l00149133/article/details ...
- CCDictionary 用调试器查看问题
if(dic->objectForKey("uid")) uid = dic->valueForKey("uid")->getCString( ...
- NodeRED常用操作
NodeRED常用操作 记录使用在云服务器操作NodeRED过程中常用的一些过程或方法 重启NodeRED 通过命令行重启 我的NodeRED在pm2的自启动管理下,因此使用pm2进行重启 pm2 r ...
- Flink-v1.12官方网站翻译-P014-Flink Architecture
Flink架构 Flink是一个分布式系统,为了执行流式应用,需要对计算资源进行有效的分配和管理.它集成了所有常见的集群资源管理器,如Hadoop YARN.Apache Mesos和Kubernet ...
- 从微信小程序到鸿蒙js开发【04】——list组件
目录: 1.可滚动区域 2.list + list-item 3.list + list-item-group + list-item 1.可滚动区域 在许多场景中,页面会有一块区域是可滚动的,比如这 ...
- Codeforces Round #625 Div. 2 D E
D题:https://codeforces.com/contest/1321/problem/D 题意:题目给个有向图,然后给一段序列,我们要沿着这个序列走,问走的过程中当前点到t的最短路会重构多少次 ...
- 最近公共祖先(LCA)---tarjan算法
LCA(最近公共祖先).....可惜我只会用tarjan去做 真心感觉tarjan算法要比倍增算法要好理解的多,可能是我脑子笨吧略略略 最近公共祖先概念:在一棵无环的树上寻找两个点在这棵树上深度最大的 ...
- HDU6434 Count【欧拉函数 线性筛】
HDU6434 I. Count T次询问,每次询问\(\sum_{i=1}^{n}\sum_{j=1}^{n-1}[gcd(i-j,i+j)=1]\) \(T\le 1e5, n \le 2e7\) ...