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<!DOCTYPE html> <html> <body> <p>在此示例中，break 语句引用标记为“Loop1”的 for 循环。 当j等于2时，break语句“跳出”Loop1。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var text = ""; var i, j; Loop1: // 第一个 for 循环标记为“Loop1” for (i = 0; i < 3; i++) { text += "<br>" + "i = " + i + ", j = "; Loop2: // 第二个 for 循环标记为“Loop2” for (j = 0; j < 5; j++) { if (j === 2) { break Loop1; } document.getElementById("demo").innerHTML = text += j + " "; } } } </script> </body> </html>