What does runtime error mean in javascript

In JavaScript, a runtime error refers to an error caused when a JavaScript script attempts to perform an action that the system cannot run. JavaScript runtime errors occur when a script is running, variable expressions are evaluated, or memory is dynamically allocated.

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

javascript runtime errors

JavaScript runtime errors are errors caused when a JavaScript script attempts to perform an action that the system cannot run. JavaScript execution errors are prone to occur when running scripts, calculating variable expressions, or dynamically allocating memory.

Error number	Description
5029	The array length must be a finite positive Integer
5030	Must be assigned to the array length as a finite positive number
5028	Requires Array Or arguments object
5010	Requires Boolean
5003	Cannot assign a value to the function return value
5000	Cannot assign a value to 'this'
5006	Requires a Date object
5015	Requires Enumerator object
5022	Exception thrown, but could not be caught
5020	")" is missing in the regular expression
5019	"]" is missing in the regular expression
5023	The function does not have a valid Prototype object
5002	Requires a Function object
5008	Illegal assignment
5021	Invalid character set range
5014	Requires JScript object
5001	Requires Number type
5007	Requires Object type
5012	Requires members of the object
5016	Requires regular expressions Expression object
5005	Requires String
5017	Regular expression syntax error
5026	The number of digits in the decimal part is out of bounds
5027	The precision is out of bounds
5025	The encoding of the URI to be decoded is illegal
5024	The URI to be decoded contains illegal characters
5009	Undefined identifier
5018	Unexpected qualifier
5013	Requires VBArray

JavaScript syntax error

JavaScript syntax error is caused when a JavaScript statement violates one or more syntax rules of the JavaScript scripting language mistake. JavaScript syntax errors occur during program compilation, before you start running the program.

##1031Requires constant1023 Hexadecimal number required1010Identifier required1028Identifier required , string or number1024Requires "while"1014Illegal characters1026Tag not found1025Duplicate tag definition1018There is a 'return' statement outside the function1002Syntax error1035"Throw" must be followed by an expression and on the same source code line1016The comment is not ended 1015String constant is not ended

Error number	Description
1019	There cannot be a "break" outside the loop ”
1020	There cannot be “continue” outside the loop
1030	Conditional compilation has been Close
1027	There can only be one "default" in a "switch" statement
1005	Requires "("
1006	Requires ")"
1012	Requires" /”
1003	requires”:”
1004	requires”;”
1032	Requires "@"
1029	Requires "@end"
1007	Requires "]"
1008	Requires "{"
1009	Requires "}"
1011	Requires "="
1033	Requires "catch"

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