要完成此效果需要两个步骤 第一步：把如下代码加入到区域中 <script LANGUAGE="JavaScript"> var js_mult1=3141 var js_mult2=5821 var js_m1=100000000 var js_m2=10000 var js_iseed=0 var js_iseed1=0 var js_iseed2=0 function random(n) { if (js_iseed == 0) { now = new Date() js_iseed = now.getHours() + now.getMinutes() * 60 + now.getSeconds() * 3600 } js_iseed1 = js_iseed / js_m2 js_iseed2 = js_iseed % js_m2 var tmp = (((js_iseed2 * js_mult1 + js_iseed1 * js_mult2) % js_m2) * js_m2 + (js_iseed2 * js_mult2)) % js_m1 js_iseed = (tmp + 1) % js_m1 return (Math.floor((js_iseed/js_m1) * n)) } var myNumber = 0 var nGuesses = 0 function guessnum() { var response var num = parseInt(document.forms[0].guess.value) document.forms[0].guess.value = num // visual feedback in case of NaN nGuesses++ // increase the guess count response = "哦，你猜的数 " if (num < myNumber) response = response + "太小了" if (num > myNumber) response = response + "太大了" if (num == myNumber) { response = response + "对了！！你猜到我了！" nGuesses = 0 myNumber = random(100)+1 } document.forms[1].result.value=response document.forms[1].guesses.value=nGuesses document.forms[0].guess.focus() document.forms[0].guess.select() return true } function giveup() { var response nGuesses = 0 response = "我的数字是" + myNumber +". 想猜我的新数吗？" myNumber = random(100)+1 document.forms[1].result.value=response document.forms[1].guesses.value=nGuesses document.forms[0].guess.focus() document.forms[0].guess.select() } </script> 我手中有一个数，它的范围在1~100之间，你能猜到它是几吗？ <script> myNumber = random(100)+1 nGuesses = 0 </script>

填入你猜的数:

你已猜了: 次 提示信息:

第二步：把“onLoad="document.forms[0].guess.focus(); document.forms[0].guess.select()"”加在标记里 例如：