JS
window.onload = function(){
var
typewriterArr = [],//打字的数据库队列
typewritering = false,//打字机的线程是否开启
typewriterID = -1,//打字机的线程ID
typewriterTime = 1000,//超时调用的时间
typewriterEffect = function(e, str, color){//增加显示的元素
typewriterArr.push({
"context" : e,//目标元素上下文
"str" : str,//显示的元素
"lening":0,//截取的进度
"maxLength":str.length//最大进度
});
e.style.color = color || "#000000";//设置元素颜色
},
closeTypewriter = function(){//关闭间时调用
clearTimeout(typewriterID);//清除线程
typewritering = false;//改变状态
},
typewriterUi = function(){//间时调用显示Ui
var i = 0,
l = typewriterArr.length,
eing = null;
for(; i < l; i++){
eing = typewriterArr[i]
/*判断中英文进行+2或+1操作
递增，获取最新截取的长度*/
eing.lening++;
//如果截取的长度超过最大长度，则截取的长度设置为1
if(eing.lening > eing.maxLength) eing.lening = 0;
//显示截取的字符
eing.context.innerHTML = eing.str.substring(0, eing.lening) + "_";
}
typewriterID = setTimeout(typewriterUi, typewriterTime);
},
//开启间时调用 ， 参数为设置超时调用的时间
startTypewriter = function(typewriterTime){
if(!typewritering){//如果没有开启，则开启
typewriterTime = typewriterTime || typewriterTime;
typewriterUi();//开始超时调用
}
};
typewriterEffect(
document.getElementById("typewriterEffect"),
"打字机效果",
"red");
typewriterEffect(
document.getElementById("typewriterEffect2"),
"欢迎您学习JavaScript！！！",
"green");
startTypewriter(100);
};