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JavaScript Operator Precedence 运算符优先级
tryjs_assign_logical_or
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<!DOCTYPE html> <html> <body> <h1>JavaScript Assignments</h1> <h2>Logical OR Assignment</h2> <h3>The ||= Operator</h3> <p>If the first value is false, the second value is assigned:</p> <p id="demo"></p> <script> let x = false; x ||= 10; document.getElementById("demo").innerHTML = "Value of x is: " + x; </script> </body> </html>