ElemeFE / ElemeFE/element

[Bug Report] textarea中有换行存在时,回显字数统计不一致

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Description

### Element UI version
2.13.2

### OS/Browsers version
win10

### Vue version
2.6.10

### Reproduction Link
https://elementui.github.io/issue-generator/#/zh-CN

### Steps to reproduce
1.页面标签:el-input type="textarea" v-model="input" max-length="3" show-word-limit
2.输入 "11" 换行,此时显示的字数统计是3,存入数据库。
3.数据库拿到存入的数据在同一个组件内回显,显示字数是4,超出长度,校验失败。

### What is Expected?
1.页面标签:el-input type="textarea" v-model="input" max-length="3" show-word-limit
2.输入 "11" 换行,此时显示的字数统计是3,存入数据库。
3.数据库拿到存入的数据在同一个组件内回显,显示字数是3,校验正常。

### What is actually happening?
1.页面标签:el-input type="textarea" v-model="input" max-length="3" show-word-limit
2.输入 "11" 换行,此时显示的字数统计是3,存入数据库。
3.数据库拿到存入的数据在同一个组件内回显,显示字数是4,超出长度,校验失败。

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