要完成此效果把如下代码加入到区域中

要完成此效果把如下代码加入到<body>区域中 <SCRIPT> function scram(v) { if(v>20){alert("Too many symbols, change "+v+" to a lesser value, 20 or under.");document.cow.noyey.focus()} else { i=0 str="" while(i<v) { x=Math.round(Math.random()*100) if(x<33 || x>255){} else{ i++ str+=String.fromCharCode(x) }} document.cow.noy.value=str }} </SCRIPT> <FORM name="cow"> 随机的字符:<INPUT TYPE="Text" name="noy" value="" size="20" onFocus="this.blur()"><br> 请输入字符?(max 20):<INPUT TYPE="Text" name="noyey" value="20" size="4"><br> <input type="button" onClick="scram(noyey.value)" value="产生文字"> <INPUT TYPE="reset"> </FORM>