1:常规写法
<el-form
:model="ruleForm"
:rules="rules"
ref="ruleForm"
>
<el-form-item label="数字范围1-500" prop="num" :rules="rules.num">
<el-input v-model="ruleForm.num" ></el-input>
</el-form-item>
</el-form>
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2:使用rules属性写法
在常规的写法上加上:rules属性
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3:写在标签中
注意和第1中常规的validator的值的位置
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4:两者的位置
a:在data函数中,return之前
b:在data的return里面
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