javascript debugger statement

JavaScript For statement Use instance Tutorial The number of times specified to execute the same code block in JavaScript or the specified condition is true. ExampleFor loopHow to write a link. The number of times that the same code block is run by the closed loop used. HTML title by loopingHow to use the loop loop through different HTML headings.

Make your JavaScript code more readable using the with () Statement The with () Statement in Javascript is identical to the with statement found in Visual Basic. using with (), you can reduce object references and make your code more readable. surprisingly, it is possible t

1) Brief descriptionthe WITH statement can be conveniently used to refer to an existing property in a particular object, but cannot be used to add properties to an object.To create a new property for an object, you must explicitly refer to the object. 2) syntax formatWith (object instance){//code block}sometimes, in a program code, I need to use the properties or methods of an object many times, according to the previous wording, all through: Object.

javascript--Grammar 21, experienceWhen judging, keep the left side constant.Switch in Java only supports four types, JavaScript is a weak type, and all are supported.Display method:x=// alert ("+x");/ /write data directly to the current page. document.write ("x=" +x+ "Second, the Code12345678102 103 104 the 106107javascript--Syn

For statement syntax:for (initialization; Expression post-loop-expression) statementInitialization expression controls expression after loop expressionExample:var count = ten; for (var i = 0; i ) { alert (i);}The above code defines the initial variable of I as 0. The code in the loop body may not be executed only if the conditional expression (I This for Loop statement has the same functionality as the

The basic syntax of JavaScript is very similar to C/java, and, more specifically, JavaScript has a for-in statement that can be used to traverse properties in an object. Code collated from w3school:http://www.w3school.com.cn：Code:Javascript: Basic statement (If-else/switch/for/while/for-in/try-catch)

Use the switch statement to select one of several code blocks to execute.GrammarSwitch (n) {Case 1: Execute code block 1 break;case 2: Execute code block 2 break;default: N code that executes when different from 1 and 2How it works: first set an expression n (usually a variable). The value of the subsequent expression is compared to the value of each case in the structure. If there is a match, the code block associated with the case is executed.

1. document.write (""); The comments in the output statement 2.JS are//3. The traditional HTML document order is: document->html-> (head,body) 4. The DOM order in a browser window is: window-> (Navigator,screen, history,location,document) 5. Get the name and value of the element in the form: document.getElementById ("ID of element in form"). Name (or value) 6. A lowercase to uppercase JS: document.getElementById ("Output"). Value = document.getElement

In JavaScript, we may rarely use a label statement, but it is a good practice to apply a label statement, especially in a nested loop, where the continue and label can be accurately returned to the location of the program you want. Label statements, according to the book said the syntax is: label:statement: begin:for (var i = 0; i To give a more typical example,

above example can be used. The Code is as follows: For (var I = 0, len = a. length; I Alert (a [I]);} This method is cyclically listed, but sometimes this method does not necessarily work. For example: The Code is as follows: Var a = {"first": 1, "second": 2, "third": 3 }; At this time, we can only use for in to make effort. Whether an object can be used for in is exhaustive. We can use the propertyIsEnumerable attribute to determine whether an object can be used for in, which is describe

above example can be used. The code is as follows: For (var I = 0, len = a. length; I Alert (a [I]);} This method is cyclically listed, but sometimes this method does not necessarily work. For example: The code is as follows: Var a = {"first": 1, "second": 2, "third": 3 }; At this time, we can only use for in to make effort. Whether an object can be used for in is exhaustive. we can use the propertyIsEnumerable attribute to determine whether an object can be used for in, which is describe