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html 只能輸入固定長度數字

    <input  id="testPaperBuyBoxes" name="testPaperBuyBoxes"  maxlength="3" type="text"
                                               onkeyup="if(this.value.length==1){this.value=this.value.replace(/[^1-9]/g,'')}else{this.value=this.value.replace(/\D/g,'')}"
                                               onafterpaste
="if(this.value.length==1){this.value=this.value.replace(/[^1-9]/g,'')}else{this.value=this.value.replace(/\D/g,'')}" />

maxlength=”3” type=”text”