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法一：（复杂）
<input type="number" oninput="if(!/^[0-9]+$/.test(value))
value=value.replace(/\D/g,'');if(value>100)value=100;if(value<0)value=null"
v-model='testNum'>
核心判断：
oninput="if(!/^[0-9]+$/.test(value))
value=value.replace(/\D/g,'');if(value>100)value=100;if(value<0)value=null"
判断语句一共三个if
（1）先用正则判断是否为正整数，如果不是，就用replace方法将非数字的字符替换为为空
（2）判断范围，大于100，就让输入的值直接为100,
（3）小于0，就让输入的值为null
注意：需要将input的type类型设置为number类型，是限制只能输入数字（包含浮点型和整型数据）
法二：（简单）
<input type="number" min='0' max='100' v-model='testNum'>
直接通过设置是三个属性，type、min、max即可，就可以设置0~100的整数
注意：如果想输入浮点型数据，就将min、max 后增加小数位数定义浮点类型数据的输入
<input type="number" min='0.00' max='100.00' v-model='testNum'>
补充：
还有一个属性step，input框可以通过键盘的上下键去增加或者减少input输入的数值，step设置为多少，那么增加或者减少的幅度就是多少。例如：
<input type="number" min='0.00' max='100.00' step='0.1' v-model='testNum'>
step='0.1' 那么通过键盘加减幅度就是0.1
法二有时候会失效，没找到原因~
失效的话就用法一~
