el-input-input表单验证

el-input表单验证可以通过设置v-model.number属性为true来限制输入为数字。同时，可以使用input事件结合字符串的replace()方法将非数字的内容替换为空，这样就只能输入正整数了。例如：

<el-input v-model.number="val" type="tel" @input="val = val.replace(/[^\d]/g,'')" />

这样设置后，输入框只能输入数字，并且非数字的内容会被替换为空。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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