<template>
  <div class="login-container">
    <el-input
      v-model="pwd"
      :type="type"
      class="pwd-input"
      placeholder="请输入密码"
    >
      <i
        slot="suffix"
        class="icon-style"
        :class="elIcon"
        autocomplete="auto"
        @click="flag = !flag"
      />
    </el-input>
  </div>
</template>
<script>
export default {
  data() {
    return {
      flag: false
    };
  },
  computed: {
    type() {
      return this.flag ? "text" : "password";
    },
    elIcon() {
      return this.flag ? "el-icon-minus" : "el-icon-view";
    }
  }
};
</script>
<style>
.icon-style {
  margin-top: 8px;
  font-size: 18px;
}
.pwd-input {
  border: 1px solid #fff;
  width: 250px;
}
</style>

 参考文档

vue给input密码框设置眼睛睁开闭合对于密码显示与隐藏_input设置输入密码效果-CSDN博客

【饿了么UI】elementUI密码框图标实现睁眼和闭眼效果（阿里巴巴iconfront图标库vue项目本地引用）_element密码图标-CSDN博客