html:
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js:
var contentBox = document.getElementById('comment_content');
var max = +document.getElementById('write_num').innerHTML.split('/')[1];
function maxStr (dom, num) {
var flag = true;
dom.onkeydown = function (e) {
if (!flag) {
return false;
}
flag = false;
var that = this;
let nowLength = this.value.split('').length;
if (nowLength === max&& e.keyCode !== 8) {
return false;
}
setTimeout(function () {
document.getElementById('write_num').innerHTML = that.value.split('').length + '/' + max;
},0);
}
dom.onkeyup = function () {
flag = true;
}
}
maxStr(contentBox, max);
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