如何在前端控制只能输入数字和小数点?

只能输入0--9的数值和小数点如何控制?

谢谢!
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1<input onkeypress="var k=event.keyCode; if ((k==46) ¦ ¦ (k&lt;=57 &amp;&amp; k&gt;=48)) return true; else return false" onpaste="return false" type="text"/>

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1<input onkeypress="if(isNaN(this.value))this.value=this.value.slice(0,-1);" onpaste="return false" type="text"/>
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