html中输入框对金额字段的控制

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<input id="amt" type="text" name="amt" placeholder="金额/元" title="金额/元" 
							required="required" onkeyup="this.value=/^[0-9]*\.?[0-9]{0,2}$/.test(this.value) ? this.value : this.value.substring(0,this.value.length-1)"/>元