限制输入纯数字
<el-input v-model="WeChatPhone" oninput="value=value.replace(/[^\d]/g,'')" placeholder="请输入手机号码" ></el-input>
限制输入小数不限位数
<el-input v-model="WeChatPhone" oninput="if(value.indexOf('.')>0){value=value.slice(0,value.indexOf('.')+99)}{if(isNaN(value)){value=null}}" placeholder="请输入手机号码" ></el-input>