JavaScript中的短路赋值
以下是 JavaScript 中实现短路赋值的代码 -
示例
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>Document</title> <style> body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .result, .sample { font-size: 20px; font-weight: 500; color: blueviolet; } .sample { color: red; } </style> </head> <body> <h1>Short-circuit assignment</h1> <div class="sample">a=22 || 0 || 0<br />b=0 && 22 && 22</div> <div class="result"></div> <br /> <button class="Btn">Click Here</button> <h3>Click on the above button to see the values of variable a and b in the above expression</h3> <script> let resEle = document.querySelector(".result"); let BtnEle = document.querySelector(".Btn"); BtnEle.addEventListener("click", () => { let a, b; a = 22 || 0 || 0; b = 0 && 22 && 22; resEle.innerHTML = "a = " + a + "<br>"; resEle.innerHTML += "b = " + b + "<br>"; }); </script> </body> </html>
输出
单击“单击此处”按钮后,将计算该表达式。这里要注意的是,非零数字计算结果为 false。
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