WEB前端开发

上接http://www.css88.com/archives/1910
这里新加了一个extend方法.

function extend(des, src) {
if (!des) {
des = {};
}
if (src) {
for (var i in src) {
des[i] = src[i];
}
}
return des;
}
function MagicColor(elem,colors,interTime){
this.elements=elem||[];
this.colors=colors||["#CC0000","#CC6D00","#CCCC00","#00CC00","#0000CC","#00CCCC","#CC00CC"];
this.indexColors=0;
this.interTime=interTime;
}
extend(MagicColor.prototype,{
timerCall:function (){
var elem=this.elements;
var color=this.colors[(this.indexColors++)%this.colors.length];
for(var i=0;i<elem.length;i++){
elem[i].style.color=color;
}
},
reset : function(){
if(this.timer){
clearInterval(this.timer);
delete this.timer;
}
},
start:function(){
this.reset();
var self=this;
this.timer= setInterval( function(){
self.timerCall();
},this.interTime||100);
}
});

调用还是：

function $(id){return document.getElementById(id)}
var effect = new MagicColor([$("comment1"),$("comment2"),$("comment3")],["#000000","#CC0000","#C00000","#00CC00","#0000CC","#00CCCC","#CC00CC"],500);
effect.start();

这是一题知名公司的前端开发面试试题，要求写出闪光字的效果。基本思路是：

1.页面中可能多出使用；

2.选出几种颜色；

3.选择合理的跳动时间。

例如html代码

<div id="comment1">愚人码头</div>
<div id="comment2">前端开发</div>
<div id="comment3">http://www.css88.com</div>

javascript代码：

function MagicColor(elem,colors,interTime){
this.elements=elem||[];
this.colors=colors||["#CC0000","#CC6D00","#CCCC00","#00CC00","#0000CC","#00CCCC","#CC00CC"];//可选的颜色值
this.indexColors=0;//颜色值索引
this.interTime=interTime;//跳动的间隔时间
}
MagicColor.prototype.timerCall=function(){
var elem=this.elements,cls=this.colors;
var color=this.colors[(this.indexColors++) % this.colors.length];//去除当前颜色
for(var i=0;i<elem .length;i++){
elem[i].style.color=color;
}
};

MagicColor.prototype.reset=function(){
if(this.timer){
clearInterval(this.timer);
delete this.timer;
}
};
MagicColor.prototype.start=function(){
this.reset();
var self=this;
this.timer = setInterval(function(){
self.timerCall();
},self.interTime||100);

}
function $(id){return document.getElementById(id)}
var effect = new MagicColor([$("comment1"),$("comment2"),$("comment3")],["#000000","#CC0000","#C00000","#00CC00","#0000CC","#00CCCC","#CC00CC"],500);
effect.start();

感谢肉块的指教，欢迎大家拍砖。

下接：http://www.css88.com/archives/1921