<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'>
window.onload=function(){
input = document.getElementById('input');
output = document.getElementById('output');
div = document.createElement('div');
function update() {
div.textContent = input.value;
output.value = div.innerHTML;
}
function reverse() {
div.innerHTML = output.value;
input.value = div.textContent;
}
input.oninput = update;
output.oninput = reverse;
output.onclick = function() {
this.select();
}
}
</script>
</head>
<body>
<textarea id="input" placeholder="Place your HTML here."></textarea>
<textarea id="output" placeholder="The escaped string HTML will output here."></textarea>
</body>
</html>
【textarea】
