JavaScript 中的宽松相等性
宽松相等性运算符 "==" 允许我们先转换两个或更多操作数的值成一种常见类型,然后检查它们之间的相等性,以将它们进行比较。
以下是 JavaScript 中实现宽松相等性的代码 −
举例
<!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 { font-size: 20px; font-weight: 500; color: blueviolet; } </style> </head> <body> <h1>Loose equality in JavaScript.</h1> <div class="result"></div> <br /> <button class="Btn">CLICK HERE</button> <h3>Click on the above button see some comparisons using loose equality</h3> <script> let resEle = document.querySelector(".result"); let BtnEle = document.querySelector(".Btn"); BtnEle.addEventListener("click", () => { resEle.innerHTML = "According to loose equality <br>"; if (1 == "1") { resEle.innerHTML += "1 is equal to '1'<br>"; } if (undefined == null) { resEle.innerHTML += "undefined is equal to null <br>"; } }); </script> </body> </html>
输出
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