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how to disabled alert function in javascript

alert 阻塞主线程

default

alert;
// ƒ alert() { [native code] }

alert(`1`);

OK

alert(`1`);
// alert: 1
// true

alert;
// ƒ (n){try{console.log("alert: "+n)}catch(t){}return!0}

window.alert = function(n){
  try{
    console.log("alert: "+n)
  } catch(e){
     // ignore
  }
  return !0;
}

!0 === true;
// true

customize alert

window.alert = function(n){
  try{
    console.log("alert =", n)
  } catch(e){
     // ignore
  }
  return `this is a changed alert!`;
}

alert(`1`);
// alert = 1
// "this is a changed alert!"

cnblogs

https://www.cnblogs.com/js/blog-common.min.js

demo

function a(){
  var i=0;
  function b(){
    i++;
    alert(i);
  }
  return b;
}

var c = a();

c();
// alert: 1

c();
// alert: 2

c();
// alert: 3

refs

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