博客园的第一篇blog

判断输入框是否是数字的样式及htc文件，注意　../css/isNumber.htc这个路径是相对于当前页面的，
input.isNumber{
 behavior:url(../css/isNumber.htc);
}

<PUBLIC:COMPONENT>
        <PUBLIC:ATTACH EVENT="onkeypress"                ONEVENT="keyPress()"/>
<PUBLIC:ATTACH EVENT="onkeypress"                ONEVENT="keyPress()"/>
<PUBLIC:ATTACH EVENT="onkeyup"                ONEVENT="keyUp()"/>
<PUBLIC:ATTACH EVENT="onblur"                ONEVENT="onBlur()"/>
   <PROPERTY NAME="t_value" />
<PROPERTY NAME="o_value" />

 <script language="JavaScript">

                function keyPress(){
        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;
    }
    function keyUp(){
        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;
    }
    function 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
        };
    }

        </script>
</PUBLIC:COMPONENT>