https://blog.csdn.net/cmj8043719242/article/details/89014025?utm_medium=distribute.pc_aggpage_search_result.none-task-blog-2~all~sobaiduend~default-1-89014025.nonecase
input只能输入数字并限制长度
限制长度(字符数)
<input type="number" oninput="if(value.length>11)value=value.slice(0,11)" />
限制大小(最大值、最小值)
//限制最大值30
<input type="number" oninput="if(value>30)value=30" />
//限制最小值0
<input type="number" oninput="if(value<0)value=0" />