本文實例講述了javascript實現淡藍色的鼠標拖動選擇框。分享給大家供大家參考。具體實現方法如下：
<!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"><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><style type="text/css">#rectBox{background:#CCFFFF;border:2px solid #0099FF;filter:alpha(opacity=30);opacity:0.3;position:absolute;}</style><head><title>一個鼠標選擇框</title><script type="text/javascript">function Rect(){this.doc = document.documentElement;if(!this.doc) return;this.startX = '';this.startY = '';this.rect = null;rectSelf = this;}Rect.prototype.down = function(e){var e = e?e:window.event;rectSelf.startX = e.clientX?e.clientX + document.body.scrollLeft:e.pageX;rectSelf.startY = e.clientY?e.clientY + document.body.scrollTop:e.pageY;rectSelf.showRect(true);}Rect.prototype.up = function(e){rectSelf.rectBox.style.width = '0px';rectSelf.rectBox.style.height = '0px';rectSelf.showRect(false);}Rect.prototype.move = function(e){if(rectSelf.rectBox){var currentX = e.clientX?e.clientX + rectSelf.doc.scrollLeft:e.pageX;var currentY = e.clientY?e.clientY + rectSelf.doc.scrollTop:e.pageY;rectSelf.rectBox.style.width = Math.abs(currentX - rectSelf.startX) + 'px';rectSelf.rectBox.style.height = Math.abs(currentY - rectSelf.startY) + 'px';if(currentX - rectSelf.startX < 0){rectSelf.rectBox.style.left = currentX + 'px';}if(currentY - rectSelf.startY < 0){rectSelf.rectBox.style.top = currentY + 'px';}//document.title = "left:"+currentX + 'px '+"top:"+currentY + 'px ';}}Rect.prototype.showRect = function(bool){if(bool){if(!this.rectBox){this.rectBox = document.createElement("div");this.rectBox.id = "rectBox";document.body.appendChild(this.rectBox);}this.rectBox.style.display = "block";this.rectBox.style.left = this.startX + 'px';this.rectBox.style.top = this.startY + 'px'; this.addEventListener(this.doc , 'mousemove' , this.move);}else{if(this.rectBox){this.rectBox.style.display = "none";}this.removeEventListener(this.doc , 'mousemove' , this.move);}}Rect.prototype.addEventListener = function(o,e,l) {if (o.addEventListener) {o.addEventListener(e,l,false);} else if (o.attachEvent) {o.attachEvent('on'+e,function() {l(window.event);});}}Rect.prototype.removeEventListener = function(o,e,l) {if (o.removeEventListener) {o.removeEventListener(e,l,false);} else if (o.detachEvent) {o.detachEvent('on'+e,function() {l(window.event);});}}window.onload = function(){var oRect = new Rect();oRect.addEventListener(oRect.doc , 'mousedown' , oRect.down);oRect.addEventListener(oRect.doc , 'mouseup' , oRect.up);}</script></head><body><h1>拖動你的鼠標就會出現選擇框</h1></body></html>希望本文所述對大家的javascript程序設計有所幫助。
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