js 常见错误

1    类型错误  

Uncaught TypeError: undefined is not a function

eg:  

var foo = undefined;
foo();

2  引用错误

Uncaught ReferenceError: Invalid left-hand side in assignment

 

eg: 

if(doSomething() = 'somevalue')

3 循环引用的对象 传递给  JSON.stringfy  会引起错误 

Uncaught TypeError: Converting circular structure to JSON

eg:

4 Unexpected token ;

eg :

5  语法错误

Uncaught SyntaxError: Unexpected token ILLEGAL

Unterminated String Literal, Invalid Line Terminator

字符串文本未终止， 

6  类型错误

Uncaught TypeError: Cannot read property ‘foo’ of null, Uncaught TypeError: Cannot read property ‘foo’ of undefined

eg:

 

7   类型错误

Uncaught TypeError: Cannot set property ‘foo’ of null, Uncaught TypeError: Cannot set property ‘foo’ of undefined

eg:

8   范围错误

Uncaught RangeError: Maximum call stack size exceeded

eg:  函数无限递归调用

9  URI 错误

无效的  decodeURIComponent  调用所致 

10  xmlHttpRequest引起的

XMLHttpRequest cannot load [http://some/url/](http://some/url/). No ‘Access-Control-Allow-Origin’ header is present on the requested resource

确保url是正确，保证同源策略

11  InvalidStateError  无效状态错误

 

InvalidStateError: An attempt was made to use an object that is not, or is no longer, usable

引用一个无效的对象， 确保代码运行的时机正确