JS method to achieve text dropping effect_javascript skills-JS Tutorial-php.cn

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JS method to achieve text dropping effect_javascript skills

May 16, 2016 pm 04:00 PM

The example in this article describes how to achieve the text drop effect using JS. Share it with everyone for your reference. The specific implementation method is as follows:

&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"&gt;
&lt;html xmlns="http://www.w3.org/1999/xhtml" xml:lang="ru"&gt;
&lt;head&gt;
&lt;title&gt;&lt;/title&gt;
&lt;meta http-equiv="Content-Type" content="text/html; charset=utf-8" /&gt;
&lt;script src="jquery-1.6.2.min.js" type="text/javascript"&gt;&lt;/script&gt;
&lt;style type="text/css"&gt;
.canvas{
width:500px;
height:500px;
position:relative;
}
&lt;/style&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;div&gt;
&lt;input type="button" onclick="javascript:falling.init();" value="GO" /&gt;
&lt;/div&gt;
&lt;div class="canvas" id="canvas"&gt;&lt;/div&gt;
&lt;script type="text/javascript"&gt;
/*
*坠落效果
*/
function Falling(){
 this.dict=["abcd","2222","sign","next","container","content","last","break","less","than","that","absolute","relative","my","index","html","java","c#","web","javascript","php","include","shit","bull","big","smart","call","apply","callee","caller","function"];
 this.canvas=$("#canvas");
 this.step=15;
 this.freq=10;
 this.height=500;
 this.width=500;
 this.si=null;
}
Falling.prototype={
 fallingAction:function(dom){
  var self=this;
  var freqs=[10,15,20];//每次下落的距离
  var disS=[];//记录所有dom的当前距离
  var disPerFreqS=[];//每个dom的
  var targetDis=500;
  var domCssTopS=[];//所有dom的top属性
  var successDom=[];//记录哪些dom已经结束运动
  var successCount=0;//有多少个dom已经结束
  var total=dom.length;
  var freqMarkLength=freqs.length;
  for(var i=0,j=dom.length;i&lt;j;i++){
   domCssTopS[i]=dom[i].position().top;
   disS[i]=0;
   disPerFreqS[i]=freqs[parseInt(Math.random()*freqMarkLength)];
  }
  self.si=setInterval(function(){
   if(successCount&gt;=total){
    clearInterval(self.si);
   }
   for(var i=0,j=dom.length;i&lt;j;i++){
    if(typeof(successDom[i])!="undefined" && successDom[i]=="ok"){
     continue;
    }
    disS[i] += disPerFreqS[i];
    if(disS[i] &gt;= targetDis){
     dom[i].css("top", targetDis+domCssTopS[i]);
     successDom[i]="ok";
     successCount++;;
    }else{
     dom[i].css("top", disS[i]+domCssTopS[i]);
    }
   }
  },self.freq);
 },
 init:function(){
  var self=this;
  self.canvas.html('');
  var dom=[];
  var l=0;
  var t=0;
  var tempDom=$("&lt;div style='position;absolute;left:-100000;visibility:hidden'&gt;&lt;/div&gt;").appendTo($("body"));
  for(var i=0,j=self.dict.length;i&lt;j;i++){
   dom[i]=$("&lt;span style='position:absolute'&gt;"+self.dict[i]+"&lt;/span&gt;").appendTo(tempDom);
   var domWidth=dom[i].width();
   var domHeight=dom[i].height();
   if(t&lt;self.height){
    if(l&lt;self.width){
     if(domWidth+l&lt;=self.width){
      dom[i].css({"top":t,"left":l});
      self.canvas.append(dom[i]);
      l += dom[i].width();
     }else{
      if(domHeight+t&lt;=self.height){
       t=t+domHeight;
       dom[i].css({"top":t,"left":0});
       self.canvas.append(dom[i]);
       l = dom[i].width();
      }else{
       break;//到极限了
      }
     }
    }else{
      if(domHeight+t&lt;=self.height){
       t=t+domHeight;
       l=0;
       dom[i].css({"top":t,"left":l});
       self.canvas.append(dom[i]);
      }else{
       break;//到极限了
      }
    }
   }//else极限
  }
  /*
  for(var i=0,l=self.dict.length;i&lt;l;i++){
   self.fallingAction(dom[i]);
  }
  */
  self.fallingAction(dom);
 }
}
var falling=new Falling();
falling.init();
&lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt;

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I hope this article will be helpful to everyone’s JavaScript programming design.

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