修改

html/typecho/usr/plugins/DPlayer/assets/editor.js

$(function () {
if ($('#wmd-button-row').length > 0) {
    $('#wmd-button-row').append('<li class="wmd-button" id="wmd-dplayer-button" style="" title="插入视频"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAABGUlEQVQ4T6XTvyuFURgH8M9lkTKYlMGiRDKIxSQDkcFgYVAmi8WPwY+Uxa8FhWQmWdgMiAxmf4BYpFAGSRkY6K1z6tJ1vTdnfc/zOU/P830z/nkyoX4GIyjHHKrQjyXUoh3raEQT9nGDjQQowjk6cYcBnOIJHbjCY4DecYtK7KIrAUqwiNHweh16sRa+DWEbD5jAIS5QgekIJB0cB3kwgNXowTLq0YpNNKMB92iLwALGCpznSnYHP4EyvP4B5gX6wlaGcfkL9Cewh0/sYDIMMdtKBcSCN4xjK0tIDXyE6c/ipVAg2Xmynescc/jWQQxSvNeCUpzl2cQqpmKUj0JsC4nCSRL/+DMl66rBcwqhGN04wHwEUtTlvvIFs5ZDZeiythMAAAAASUVORK5CYII="/></li>');
}

$(document).on('click', '#wmd-dplayer-button', function () {
    $('body').append(
        '<div id="DPlayer-Panel">' +
        '<div class="wmd-prompt-background" style="position: absolute; top: 0; z-index: 1000; opacity: 0.5; height: 875px; left: 0; width: 100%;"></div>' +
        '<div class="wmd-prompt-dialog">' +
        '<div>' +
        '<p><b>插入视频</b></p>' +
        '<p>在下方输入参数</p>' +
        '<p><input type="text" id="DP-url" value="" placeholder="链接"/></p>' +
        '<p><input type="text" id="DP-pic" value="" placeholder="封面图"/></p>' +
        '<p><input type="text" id="width" value="" placeholder="视频宽度"/></p>' +
        '<p><input type="checkbox" id="controls" checked>开启控件</input></p>' +
        '<p><input type="checkbox" id="DP-autoplay">自动播放</input></p>' +
        '</div>' +
        '<form>' +
        '<button type="button" class="btn btn-s primary" id="ok">确定</button>' +
        '<button type="button" class="btn btn-s" id="cancel">取消</button>' +
        '</form>' +
        '</div>' +
        '</div>');
});
//cancel
$(document).on('click', '#cancel', function () {
    $('#DPlayer-Panel').remove();
    $('textarea').focus();
});
//ok
$(document).on('click', '#ok', function () {
    var url = document.getElementById('DP-url').value,
        pic = document.getElementById('DP-pic').value,
        width = document.getElementById('width').value,
        controls = !!document.getElementById('controls').checked,
        autoplay = !!document.getElementById('DP-autoplay').checked;
    var tag = '<video src="' + url+ '" ';
    if(pic) tag +=  'pic="' + pic + '" ';
    if (controls) tag += 'controls="' + controls + '" ';
    if(width) tag += 'width="' + width + '" ';
    if (autoplay) tag += 'autoplay="' + autoplay + '" ';
    tag += '> </video>\n';
    
    var editor = document.getElementById('text');

    if (document.selection) {
        editor.focus();
        sel = document.selection.createRange();
        sel.text = tag;
        editor.focus();
    }
    else if (editor.selectionStart || editor.selectionStart === '0') {
        var startPos = editor.selectionStart;
        var endPos = editor.selectionEnd;
        var cursorPos = startPos;
        editor.value = editor.value.substring(0, startPos)
            + tag
            + editor.value.substring(endPos, editor.textLength);
        cursorPos += tag.length;
        editor.focus();
        editor.selectionStart = cursorPos;
        editor.selectionEnd = cursorPos;
    }
    else {
        editor.value += tag;
        editor.focus();
    }

    $('#DPlayer-Panel').remove();
})
});