switch 语句是 JavaScript 的"条件"语句的一部分,用于根据不同的条件执行不同的操作。使用 switch 选择要执行的许多代码块之一。这是长的嵌套 if/else 语句的完美解决方案。switch 语句计算表达式。然后将表达式的值与结构中每个 case 的值进行比较。如果匹配,则执行关联的代码块。
When JavaScript reaches abreakkeyword, it breaks out of the switch block. This will stop the execution inside the switch block. It is not necessary to break the last case in a switch block. The block breaks (ends) there anyway. Note:If you omit the break statement, the next case will ...
values = [c.get_attribute('innerText') for c in elements] javascript is faster, it takes 1/6 of the time values = driver.execute_script("var result = [];" + "var all = arguments[0];" + "for (var i=0, max=all.length; i < max; i++) {" + " result.push(all[i...
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To build apps though you need a working knowledge of HTML, CSS and some JavaScript. Read the chapters, do code exercises and take quizzes at the end.- https://www.w3schools.com/html/- https://www.w3schools.com/css/- https://www.w3schoo...
Javascript - Switch statement for greater-than/less-than, This is a variant of switch-range but with only one compare per case and therefore faster. The order of the case statement is important since the engine will test each case in source code order ECMAScript 2020 13.12.9. In 2021 it...
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Warning:If you omit thebreakstatement in a case that is not the last, and that case gets a match, the next case will also be executed even if the evaluation does not match the case! Example What happens if we remove thebreakstatement from case "red"?
❮ PreviousNext ❯ The switch Statement Use theswitchstatement to select one of many code blocks to be executed. Theswitchstatement in Go is similar to the ones in C, C++, Java, JavaScript, and PHP. The difference is that it only runs the matched case so it does not need abreakstat...
JavaScript Tutorial:JavaScript Switch Statement JavaScript Reference:JavaScript if/else Statement JavaScript Reference:JavaScript break Statement Browser Support switchis an ECMAScript1 (JavaScript 1997) feature. It is supported in all browsers: ChromeEdgeFirefoxSafariOperaIE ...