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Meter optimum 属性
tryjsref_meter_optimum
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<!DOCTYPE html> <html> <body> <p>Peter''s score: <meter id="myMeter" value="0.3" high="0.9" low="0.1" optimum="0.5"></meter></p> <p>Click the button to return the value of the optimum attribute of the gauge above.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { let x = document.getElementById("myMeter").optimum; document.getElementById("demo").innerHTML = x; } </script> </body> </html>