javascript中基本的函数调用

<script language="JavaScript">

function test(){

var valid = checkColor('color');

if(valid==true){

window.open("www.sina.com");

}

}

function checkColor(object){

var pattern = /^[0-9]+$/

var obj = eval("document.all['" + object + "'].value") ;

if(obj.match(pattern)==null){

alert("错误");

return false;

}

else{

alert("正确");

return true;

}

}

</script>

<input type="text" name="color">

<input type="button" value="check" onclick="test()">