Js can only enter numbers and numbers with decimal points, compatible with IE and firefox

The content of the js verification input box can only contain numbers and numbers with decimal points. Although it is a bit strange on the Internet, it is concise. According to the author's verification, there is no problem in various browsers! The following code is shared as follows:

The first method is to enter only a number and a number with a decimal point. This is correct in IE but not compatible with firefox.

<input type="text" name="price" onkeyup="if(isNaN(value))execCommand('undo')" onafterpaste="if(isNaN(value))execCommand('undo')" />

The second method is effective in IE and Firefox as follows:

<Input type = "text" name = "price" onchange = "if (/\ D /. test (this. value) {alert ('only numbers allowed '); this. value = '';}"/>

The third method has no problem in IE and Firefox:

<input type="text" name="price" value="" t_value="" o_value="" onkeypress="if(!this.value.match(/^[\+\-]?\d*?\.?\d*?$/))this.value=this.t_value;else this.t_value=this.value;if(this.value.match(/^(?:[\+\-]?\d+(?:\.\d+)?)?$/))this.o_value=this.value" onkeyup="if(!this.value.match(/^[\+\-]?\d*?\.?\d*?$/))this.value=this.t_value;else this.t_value=this.value;if(this.value.match(/^(?:[\+\-]?\d+(?:\.\d+)?)?$/))this.o_value=this.value" onblur="if(!this.value.match(/^(?:[\+\-]?\d+(?:\.\d+)?|\.\d*?)?$/))this.value=this.o_value;else{if(this.value.match(/^\.\d+$/))this.value=0+this.value;if(this.value.match(/^\.$/))this.value=0;this.o_value=this.value}" />

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