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JavaScript 2020 新特性
tryjs_assign_logical_and_and
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<!DOCTYPE html> <html> <body> <h1>JavaScript Assignments</h1> <h2>Logical AND Assignment</h2> <h3>The &&= Operator</h3> <p>If the first value is true, the second value is assigned.</p> <p id="demo"></p> <script> let x = true; let y = x &&= 10; document.getElementById("demo").innerHTML = "Value of y is: " + y; </script> </body> </html>