A code block starts with a left curly brace and ends with a right curly brace.
The function of a code block is to execute a sequence of statements together.
This example outputs a title and two paragraphs to the web page:
Example
function myFunction()
{
document.getElementById("demo").innerHTML="你好Dolly";
document.getElementById("myDIV").innerHTML="你最近怎么样?";
}
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You will learn more about functions in later chapters.
JavaScript Statement Identifier
JavaScript statements usually start with a Statement Identifier and execute the statement.
Statement identifiers are reserved keywords and cannot be used as variable names.
The following table lists JavaScript statement identifiers (keywords):
statement
description
break is used to break out of the loop.
catch statement block, executed in the try statement block Execute the catch statement block when an error occurs.
continue Skips an iteration in the loop.
do... while Execute a statement block and continue executing the statement block when the conditional statement is true. , you can execute the code block a specified number of times.
for ... in is used to traverse the properties of the array or object (loop through the properties of the array or object).
function defines a function
if ... else is used to perform different actions based on different conditions.
return exit function
switch is used to perform different actions based on different conditions.
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Detailed explanation of JavaScript string replacement method and FAQ
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Replace string inside JavaScript code
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str = str.replace("find","replace");
This method replaces only the first match. To replace all matches, use a regular expression and add the global flag g:
str = str.replace(/fi
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This in JavaScript usually refers to an object that "owns" the method, but it depends on how the function is called.
When there is no current object, this refers to the global object. In a web browser, it is represented by window.
When calling a function, this maintains the global object; but when calling an object constructor or any of its methods, this refers to an instance of the object.
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