Based on jQuery, let textarea support Ctrl Z step-by-step undo function_jquery

There is relatively little code.
The main ones are:

Copy code The code is as follows:

var log = [] ;
$(function () {
var txt = window.setInterval(function () {
if (log[log.length - 1] != $("#t").val() ) {
log[log.length] = $("#t").val();
}
}, 1500);
var isCtrl = false;
$(document ).keydown(function (e) {
if (e.which === 17)
isCtrl = true;
if (e.which === 90 && isCtrl === true) {
log.pop();
$("#t").val(log[log.length - 1]).blur();
}
}).keyup(function (e ) {
if (e.which === 17)
isCtrl = false;
});
});

Demo code:

<title></title> <textarea id="t" style="width:400px; height:300px;"> <button onclick="show()"> </button> <textarea id="s" style="width:400px; height:300px;">Show history <hr> Press Ctrl Z to undo step by step
[Ctrl A select all Note:

If you need to introduce external Js, you need to refresh to execute ]