javascript 实现自由落体的方块效果_javascript技巧-tutorial js-php.cn

javascript 实现自由落体的方块效果_javascript技巧

WBOY

Lepaskan： 2016-05-16 18:36:08

asal

1288 orang telah melayarinya

你可以试着按下鼠标左键，然后拖拽出一个方块后释放，看效果

Draw.prototype.colors = ["#CCFF99","#FF9966","#CC0000","#00FF00","#330000","#00CC00","#339900","#660066","#CC66FF","#FF00FF","#CC0000","#993300","#006600","#3300FF","#0000CC","#663300","#66CCFF","#33FF66","#669900"];

Draw.prototype.randomColor = function(){ 
return this.colors[Math.floor(Math.random()*this.colors.length)]; 
}

Draw.prototype.createDiv = function(){ 
var e = this.mouseDownEvent; 
var div = document.createElement("div"); 
div.className="container"; 
div.style.top = e.clientY + "px"; 
div.style.left = e.clientX + "px"; 
div.style.backgroundColor = this.randomColor(); 
document.body.appendChild(div); 
this.node = div; 
this.pointX = e.clientX; 
this.pointY = e.clientY; 
}

Draw.prototype.resizeDiv = function(e){ 
e = e || window.event; 
var self = this; 
self.node.style.width = Math.abs(e.clientX-self.pointX)+"px"; 
self.node.style.height = Math.abs(e.clientY-self.pointY)+"px"; 
self.node.style.left = Math.min(self.pointX, e.clientX)+"px"; 
self.node.style.top = Math.min(self.pointY, e.clientY)+"px"; 
}

Draw.prototype.drop = function(){ 
var self = this; 
self.dropId = window.setInterval(function(){ 
var dc = document.documentElement.clientHeight; 
var dh = self.node.offsetHeight; 
var dt = self.node.offsetTop; 
if(dt>=dc-dh){clearInterval(self.dropId);self.fade();} 
self.node.style.top = Math.min(dt+(++self.dropCount*2-1)*5, dc-dh)+"px"; 
},50); 
}

Draw.prototype.fade = function(){ 
var self = this; 
self.node.style.backgroundColor = self.randomColor(); 
self.node.style.filter = "alpha(opacity=100)"; 
self.node.style.opacity = 1; 
self.fadeId = window.setInterval(function(){ 
if(++self.fadeCount>100){clearInterval(self.fadeId);} 
self.node.style.filter = "alpha(opacity="+(100-self.fadeCount)+")"; 
self.node.style.opacity = (100-self.fadeCount)/100; 
},10); 
}