if(condition) { // block of code to be executed if the condition is true } Theelsestatement specifies a block of code to be executed if the condition is false: if(condition) { // block of code to be executed if the condition is true ...
Example 1: JavaScript if Statement// Program to check if the number is positive const number = prompt("Enter a number: "); // check if number is greater than 0 if (number > 0) { // the body of the if statement console.log("positive number"); } console.log("nice number"); Run...
The if statementThe else statementThe else if statementRandom linkSwitch statement Conditionals Explained JavaScript Loops For loopLooping an ArrayLooping through HTML headersWhile loopDo While loopBreak a loopBreak and continue a loopUse a for...in statement to loop through the elements of an objec...
Example Make a "Good day" greeting if the hour is less than 18:00: if (hour < 18) { greeting = "Good day"; } The result of greeting will be: Good day Try it yourself » The else StatementUse the else statement to specify a block of code to be executed if the condition is...
if(i == 3) { break; } Here, when the value of i becomes 3, the break statement is executed, which terminates the loop. Hence, the output doesn't include values greater than or equal to 3. Example 2: JavaScript break With while Loop We can terminate a while loop using the break ...
The syntax of the if, else if, else statement is builds on the above statements and can be expressed as follows: Now we can write code that includes a number of options that we can test for in our “boy” example. We can write an option for whether his homework is done or not as...
变量名必须以字母(a-z、A-Z)或下划线(_)或美元符号($)开头。 变量名可以包含字母、数字、下划线和美元符号。 变量名区分大小写,myVariable 和 myvariable 是不同的变量名。 2:关键字的限制: 不得使用 JavaScript 的关键字和保留字作为变量名,如 if、for、function 等。
Else if statements are used to handle situations where you want to order one action when a condition is true and another action when that condition is false. The Else if statement is always used with the if statementand there can be as many else if statements as the program may require. ...
// A conditional statement if (x === 0) { // Is `x` equal to zero? x = 123; } // Defining function `baz` with parameters `a` and `b` function baz(a, b) { return a + b; } 注意等号的两种不同用法: 单个等号(=)用于将一个值赋给一个变量。
();// Make all value in the arry reverse the positionarr.sort();// Defaultly, the values in the array are sorted by their order of first character in the asci table. But we can put the function defined by us into the list of arguments// For examplefunctionmysort(a,b){if(a>b)...