This JavaScript tutorial explains how to use the do-while loop with syntax and examples. In JavaScript, you use a do-while loop when you are not sure how many times you will execute the loop body and the loop body needs to execute at least once (as the c
while (condition); In while loop, the given condition is tested at the beginning, i.e. before executing any of the statements within the while loop. In case of do while loop the condition is tested after execution of the statements within the while loop. This means that do-while would e...
do/while 与 while 循环非常相似,区别在于表达式的值是在每次循环结束时检查,而不是在开始时检查。因此 do/while 循环能够保证至少执行一次循环,而 while 循环就不一定了,如果表达式的值为假,则直接终止循环不进入循环。语法格式如下: do statement while(expr) do/while循环语句的流程控制示意如图所示。 示例 针对...
JavaScriptdo...whileLoop: Example Let's take an example and see thedo...whileloop in action. In this tutorial, we explained thewhileanddo...whileloops used in the JavaScript. ← JavaScript for Loop JS Switch case → Try our new interactive courses. ...
JS:设置超时时,do-while循环在函数上无限循环 我需要一个提示窗口,让用户输入一个数字。当设置一次函数(下面的代码)时,一切都可以,但这个提示窗口应该累积,直到一个整数(从200开始)的变量达到0,所以我认为do-while循环就可以了。但是,当设置do while循环时,输入数字后会立即显示提示窗口,并且不会更改任何内容。我...
let flag = true; do { console.log("In loop"); // 应该在这里设置flag为false来退出循环 } while (flag); // 如果flag始终为true,循环将不会退出 异步操作:如果在循环中使用了异步操作(如setTimeout、fetch等),可能会导致循环提前退出,因为异步操作不会阻塞代码的执行。
Run JavaScript code from Python (EOL: https://gist.github.com/doloopwhile/8c6ec7dd4703e8a44e559411cb2ea221) - doloopwhile/PyExecJS
for in: 比较适合遍历对象,遍历对象时使用这个再合适不过。 while: while 与 for 的使用场景差不多。 do while: 至少执行一边的循环,遍历数组和字符串也很方便。 二、while遍历数组需要注意: 如果数组中有 0,null,false,undefined 或者空字符串等在 js 中被认为等价于 false 的值,会提前结束遍历。可以通过改...
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continueSkips a value in a loop whileLoops a code block while a condition is true do...whileLoops a code block once, and then while a condition is true forLoops a code block while a condition is true for...ofLoops the values of any iterable ...