代码如下： <!--脚本说明:第一步:把如下代码加入<body>区域中--> <SCRIPT> var msg = "javascript欢迎你的光临!!!" var x = "" num = 1 toggle = 1 tt = 1 OOK = 0 timval = 60 var tval = "" function switcha() { if (document.myform.dowhat.value == "Start/Stop" ) tval = "Forward/Backward" if (document.myform.dowhat.value == "Forward/Backward") tval = "Fast/Slow" if (document.myform.dowhat.value == "Fast/Slow") tval = "Start/Stop" document.myform.dowhat.value = tval } function switcha2() { if (document.myform.dowhat.value == "Start/Stop" ) toggla() if (document.myform.dowhat.value == "Forward/Backward" ) csd() if (document.myform.dowhat.value == "Fast/Slow" ) fasl() } function fasl() { timval = (timval==60 ? 150 : 60 ) } function csd() { tt = ( tt==1 ? 0 : 1) } function scroll() { if (tt==1) if (num <= msg.length) OOK = 1 if (tt==0) if (num >= 0) OOK = 1 if ( OOK == 1) { OOK = 0 x = msg.substring(0,num) document.myform.scroll.value = x num = ( tt==1 ? num+1 : num-1 ) } else { x = "" document.myform.scroll.value = "" num = (tt==1 ? 0 : msg.length ) } if (toggle == 1) setTimeout("scroll()", timval) } function toggla() { toggle = (toggle == 1 ? 0 : 1 ) if (toggle == 1) scroll() } </SCRIPT> <FORM NAME="myform"> <INPUT TYPE="text" NAME="scroll" SIZE=&{msg.length + 2}; ><br> <INPUT TYPE="button" VALUE="Do It" onClick="switcha2()"> <INPUT TYPE="text" NAME="dowhat" SIZE = 10 VALUE = "Start/Stop"> <INPUT TYPE="button" VALUE="next" onClick="switcha()" > </FORM> <!--第二步:把如下代码加入<body>区域中--> <body bgcolor="#fef4d9" onload=scroll()>
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