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HTML

Is array static: <span id="static"></span>

<input id="makeStatic" type="button" value="Make static" />

JavaScript

function makeStatic() {
	ArrayStatic = true;
  setValue();
}

function setValue() {
	el = document.getElementById("static");
  try {
  	el.textContent = ArrayStatic ? "Array is static" : "Array is not static";
  } catch (err) {
  	el.textContent = "Array is not static";
  }
}

setValue();

document.getElementById("makeStatic").onclick = makeStatic;