🎨 Vanessa219#27 placeholder

CHANGELOG.md

@@ -49,15 +49,15 @@
 
 * [open issues](https://github.com/Vanessa219/vditor/issues)
 
-### v3.0.3 / 未发布
+### v3.0.4 / 未发布
 
 * [27](https://github.com/Vanessa219/vditor/issues/27) 支持类似 Typora 的及时渲染模式 `引入特性`
+
+### v3.0.3 / 2020-03-20
+
 * [229](https://github.com/Vanessa219/vditor/issues/229) 初始化时不应该自动获取焦点 `改进功能`
 * [228](https://github.com/Vanessa219/vditor/pull/228) menu misplaced when vditor is not first child `改进功能`
 * [227](https://github.com/Vanessa219/vditor/pull/227) add jsdoc `引入特性`
-
-### v3.0.2 / 2020-03-19
-
 * [225](https://github.com/Vanessa219/vditor/pull/225) publish type declaration file `引入特性`
 * [224](https://github.com/Vanessa219/vditor/issues/224) md2html 方法报错 `修复缺陷`
 * [223](https://github.com/Vanessa219/vditor/issues/223) 下列 a 前输入 ``` b 会消失，且返回无光标 `修复缺陷`

package.json

@@ -1,6 +1,6 @@
 {
   "name": "vditor",
-  "version": "3.0.2",
+  "version": "3.0.3",
   "description": "♏ 一款浏览器端的 Markdown 编辑器。",
   "author": "Vanessa <v@b3log.org> (http://vanessa.b3log.org)",
   "homepage": "https://hacpai.com/tag/vditor",

src/ts/ir/index.ts

@@ -50,6 +50,14 @@ class IR {
             if (event.isComposing || isCtrl(event)) {
                 return;
             }
+            if ((event.key === "Backspace" || event.key === "Delete") &&
+                vditor.ir.element.innerHTML !== "" && vditor.ir.element.childNodes.length === 1 &&
+                vditor.ir.element.firstElementChild && vditor.ir.element.firstElementChild.tagName === "P"
+                && (vditor.ir.element.textContent === "" || vditor.ir.element.textContent === "\n")) {
+                // 为空时显示 placeholder
+                vditor.ir.element.innerHTML = "";
+                return;
+            }
             if (event.key.indexOf("Arrow") > -1) {
                 expandMarker(getSelection().getRangeAt(0), vditor);
             }