input使用正则不生效

<input type="text" v-model="number" @input="onlyNumber(this)"  :focus="true" maxlength="10" />  

onlyNumber(number){  
                console.log(this.number)  
                let t = this.number.charAt(0);  
                this.number = this.number.replace(/[^\d\.\-]/g,'');  
                this.number = this.number.replace(/^0\d[0-9]*/g,'');   
                this.number =this.number.replace(/^\./g,'');  
                this.number =this.number.replace(/\.{2,}/g,'.');  
                this.number = this.number.replace('.','$#$').replace(/\./g,'').replace('$#$','.');   
                this.number = this.number.replace(/^(\-)*(\d+)\.(\d\d).*$/,'$1$2.$3');  
                if(t == '-'){ return; }  

            }