It works the same way in javascript when you're communicating with the web browser and trying to make it do the things you want it to do. Probably not make coffee though. You give it different statements and it will execute them one by one in the script from top to bottom until there...
If the expression is true, then the JavaScript interpreter will execute the statement(s) in the statement block and it will evaluate the expression in parentheses again. The JavaScript interpreter will continue to loop in this way until the expression evaluates to false. Clearly, if the while ...
The most fundamental of the conditional statements is theifstatement. Anifstatement will evaluate whether a statement is true or false, and only run if the statement returnstrue. The code block will be ignored in the case of afalseresult, and the program will skip to the next section. Anif...
So, let's dive in and explore them in more detail. The following Looping statements are supported in JavaScript: For Loop While Loop Do while Loop For...In Loop For...Of Loop For Loop Statement For loop, when you execute a loop for a fixed number of times, the loop does three ...
for each-in This loop exists only on Firefox.Don’t use it. This section covers JavaScript’s conditional statements. if-then-else In anif-then-elsestatement: if(«condition»)«then_branch»⟦else«else_branch»⟧ then_branchandelse_branchcan be either single statements or blocks...
With operators that are only unary (plus is both unary and binary), you can omit the semicolon, because automatic semicolon insertion kicks in. voidfunction() {}()voidfunction() {}()// OK JavaScript inserts a semicolon after the first line, because void is not a valid way of continuin...
The advent of these solutions made it easier for developers to share and reuse code in the form ofpackages, modules that can be distributed and shared, such as the ones found onnpm. However, since there were many solutions and none were native to JavaScript, tools likeBabel,Web...
continue Jumps past all remaining statements in the innermost loop and starts the next iteration of the loop as if control had passed through to the end of the loop normally. default Defines the default case for a switch statement. do..while Similar to a while loop, except that the statemen...
In JavaScript, one uses the semicolon to chain statements: foo(); bar() For expressions, there is the lesser-known comma operator: foo(), bar() That operator evaluates both expressions and returns the result of the second one. Examples: ...
参考链接:All about IF statements and booleans in JavaScript! – Code The Web What is an if statement? In essence, an if statement simply executes some code if a value is equivalent to true. The if statement syntax if(true){alert('Yay!');} ...