js入门实例

var msg = "开始第二天的学习！";

var interval = 30;

seq = 0;

function Scroll() {

var len = msg.length;

//window.status = msg.substring(0, seq + 1);

window.status = "msg.substring(0, seq + 1);"

window.status = msg.substring(0, seq + 1);

seq++;

if (seq > len) {

seq = 0

};

window.setTimeout("Scroll();", interval);

}