alert
<!DOCTYPE html>
<body>
<button id="btn" onclick="alertfunc()">button</button>
<script>
function alertfunc(){
alert('hello!');
}
</script>
</body>
</html>
confirm
<!DOCTYPE html>
<body>
<button id="btn" onclick="confirm_func()">button</button>
<script>
function confirm_func() {
if(confirm('are you sure?')) {
alert('yes');
} else {
alert('no');
}
}
</script>
</body>
</html>
prompt
<!DOCTYPE html>
<body>
<button id="btn" onclick="prompt_func()">button</button>
<script>
function prompt_func() {
if(prompt('please write what you want to eat') == 'apple') {
alert('oh here you are');
} else {
alert('have to buy other market');
}
}
</script>
</body>
</html>
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