javascript catch syntax error

; STmpStr = sInputString. substr (I, 1 ); } SInputString = sInputString. substring (0, I + 1 ); } Return sInputString; } Is there an error in the syntax example of the regular expression self-contained in javascript chm "matching a blank line? Most of Baidu's websites are/^ \ [\ t] * $/Match a blank line.So I went to google. (Because an article in China has been

JavaScript Objects 1, the creation of the object 1) Object Initializer method Format: objectname = {property1:value1, property2:value2,..., Propertyn:valuen}property is an object's propertiesValue is the values of the object, which can be a string, a number, or one of the three objectsFor example: Var user={name: "User1", age:18};var user={name: "User1", Job:{salary:3000,title:programmer}In this way, you can also initialize the object's methods, for

\xnn A character represented by the hexadecimal code NN \unnnn A Unicode character represented by the hexadecimal code nnnn null and undefined differences Null Undefined Said Null Object pointer Variables that have not been defined typeof Operation Results Object Undefined Undefined derivation null, use = = to determine true Undefined de

JSHint-Use of javascript syntax checking standard tools and integration with Sublime 1. Install jshint of nodejs Install the Node. js Environment Install nodejs jshint [4] csshint Ii. install and configure jshint in sublime Method 1: Use Sublimelinter to support css and other language Verification Method 2: Use Sublime JSHint Gutter and only support js Verification Iii. Three con

JavaScript has many differences from the programming habits of C, Java, and so on, which may lead to many unexpected things. Today, we will discuss some javascript-related questions posted by zhihu about these tough syntax features, although it was a long time ago, these questions are quite classic, and javascript is r

"The basic syntax of JavaScript"1.javascript Outputa command issued by a JavaScript statement to the browser. The purpose of the statement is to tell the browser what to do. Insert, output. document.getElementById ("pid"). Innerhtml= "hahaha";writing content to a document through document.write ()writing content to the

ECMAScript's syntax draws heavily on the syntax of C and other C languages such as Java and Perl.1. case-sensitive2. identifiers2.1 The first character must be a letter, an underscore (_), or a dollar sign ($);2.2 Other characters can be letters, underscores, dollar signs, or numbersBy convention, The ECMAScript identifier is in Hump-case format, which is the first lowercase letter, and the first letter of

values.1.3 Variable PromotionThe JavaScript engine works by parsing the code, getting all the declared variables, and then running on a line. The result is that all declarations of variables will be promoted to the head of the code, which is called variable elevationConsole.log (a); var a = 1; at this point, the output is undefined, and does not report a undefined error. 1.3 identifiers The first

Introduction to JavaScript1, JavaScript is a scripting language, need to have a host file, his host file is an HTML file.To use : For the sake of insurance generally written after Three common dialog boxes:Alert ("Put Chinese characters in this") Warning dialog box, the function is to pop up a warning dialog, such as alert ("Input error")Confirm ("") determines the dialog box function is to pop up a selecti

I. GrammarEverything in 1.javascirpt (variables, function names, and operators) is strictly case-sensitive.2.javascript (identifier)An identifier is a variable, a function, the name of a property, or an argument to a function.Naming rules: The first character must be a letter, underscore, dollar sign, and other characters can be letters, underscores, dollar signs, or numbers.You cannot use keywords, reserved words, true,false, and null as identifiers.

Object ()); Returns True3. String (value)-----Converts the given value to a string (this function can convert any value to a string)var S1 = String (null); Returns the string "null"var S1 = String (undefined); Returns the string "undefined"The difference between the String (value) and the ToString () function is:If the ToString () function converts a value of null or undefined, an error occurs, and string () does notSeven. Date object:Create Date obj

specific type, in the following operator rule table, before the arrow is the type of the operator operand, and the type of the result of the operation after the arrow"Left value"An lvalue (Lvalue) is an ancient term that indicates that an expression can only appear to the left of the operatorIn JavaScript, variables, object properties, and array elements are both lvalueIncrement operator + +, decrement operator--and the operand type of the assignment

. Create a new file in the same format as the page encoding. copy and paste the content; (The third method is recommended, but we recommend that you add the charset attribute when importing Javascript !) Problems found: Due to the reinstallation of the system, the js error is found after the project is released: A syntax