【代码教程】Javascript canvas画图实例html代码

2013-08-18 14:01:32 -0400

代码如下：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>邮箱地址自动完成功能</title>
<meta http-equiv="content-type" content="text/html;charset=gb2312">
</head>
<body>
<input name="myInput" type="text" id="myInput" style="margin:100px;width:198px;">
<script type="text/javascript">
var MailTips = {
	mailArr:["163.com", 
			"126.com", 
			"qq.com",
			"sina.com",
			"vip.sina.com",
			"hotmail.com",
			"gmail.com",
			"sina.cn",
			"suho.com",
			"yahoo.cn",
			"139.com",
			"wo.com.cn",
			"189.cn"],
	liArr:[],
	box:null,
	input:null,
	cssUrl:'mailtips.css',
	init:function(id){
		var obj = this.input = document.getElementById(id);
		var that = this;
		if(obj.addEventListener){
			obj.addEventListener("input",that.changeEvent,false);
		}else if(obj.attachEvent){
			obj.attachEvent("onpropertychange",that.changeEvent);
		}
		this.addEvent(obj,"blur",that.focusout);
		this.addCss();
		this.createContent();
		this.box.style.top = obj.offsetTop + obj.offsetHeight + "px";
		this.box.style.left = obj.offsetLeft + "px";
	},
	changeEvent:function(){
		var str = MailTips.input.value;
		if(str.indexOf("@") == -1){
			MailTips.box.style.display = "block";
			for(var i=0;i<MailTips.liArr.length;i++){
				MailTips.liArr[i].innerHTML = str + "@" + MailTips.mailArr[i];
			}
		}
	},
	focusout:function(){
		setTimeout(function(){
			MailTips.box.style.display = "none";	
		},100)
	},
	createContent:function(){
		this.box = document.createElement("div");
		this.box.className = "mailtops_css";
		document.body.appendChild(this.box);
		var ul = document.createElement("ul");
		this.box.appendChild(ul);
		for(var i=0;i<this.mailArr.length;i++){
			var li = this.getLi();
			li.innerHTML = this.mailArr[i];
			this.liArr.push(li);
			ul.appendChild(li);	
		}
	},
	getLi:function(){
		var li = document.createElement("li");
		this.addEvent(li,"mouseover",function(){li.className = "overli";});
		this.addEvent(li,"mouseout",function(){li.className = "outli";});
		this.addEvent(li,"click",function(){MailTips.input.value = li.innerHTML;});
		return li;
	},
	addEvent:function(obj,type,fn){
		if(obj.addEventListener){
			obj.addEventListener(type,fn,false);	
		}else if(obj.attachEvent){
			obj.attachEvent("on"+type,fn);
		}
	},
	addCss:function(){
		var css = document.createElement("link")
		css.type = "text/css";
		css.href = this.cssUrl;
		css.rel = "stylesheet";
		var headElem = document.getElementsByTagName("head")[0];
		headElem.appendChild(css);	
	}
}
</script>
<script type="text/javascript">
MailTips.init("myInput");
</script>
</body>
</html>

效果如下：
Javascript canvas画图实例

请选择画笔颜色：

请选择画笔的宽度：

如果有错误，请使用橡皮擦：

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