本文實(shí)例講述了JavaScript實(shí)現(xiàn)的多種鼠標(biāo)拖放效果。分享給大家供大家參考，具體如下：
這是一款JavaScript鼠標(biāo)拖放效果代碼，通過本示例了解觸發(fā)對象，設(shè)置范圍限制，指定容器大小水平及垂直鎖定，還包括獲取和釋放焦點(diǎn)等。
運(yùn)行效果截圖如下：
在線演示地址如下：
http://demo.VeVB.COm/js/2015/js-mouse-move-fix-style-codes/
具體代碼如下：
<!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><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>拖放效果</title></head><body><script> var isIE = (document.all) ? true : false;var $ = function (id) { return "string" == typeof id ? document.getElementById(id) : id;};var Class = { create: function() { return function() { this.initialize.apply(this, arguments); } }}var Extend = function(destination, source) { for (var property in source) { destination[property] = source[property]; }}var Bind = function(object, fun) { return function() { return fun.apply(object, arguments); }}var BindAsEventListener = function(object, fun) { return function(event) { return fun.call(object, (event || window.event)); }}var CurrentStyle = function(element){ return element.currentStyle || document.defaultView.getComputedStyle(element, null);}function addEventHandler(oTarget, sEventType, fnHandler) { if (oTarget.addEventListener) { oTarget.addEventListener(sEventType, fnHandler, false); } else if (oTarget.attachEvent) { oTarget.attachEvent("on" + sEventType, fnHandler); } else { oTarget["on" + sEventType] = fnHandler; }};function removeEventHandler(oTarget, sEventType, fnHandler) { if (oTarget.removeEventListener) { oTarget.removeEventListener(sEventType, fnHandler, false); } else if (oTarget.detachEvent) { oTarget.detachEvent("on" + sEventType, fnHandler); } else { oTarget["on" + sEventType] = null; }};//拖放程序var Drag = Class.create();Drag.prototype = {//拖放對象 initialize: function(drag, options) { this.Drag = $(drag);//拖放對象 this._x = this._y = 0;//記錄鼠標(biāo)相對拖放對象的位置 this._marginLeft = this._marginTop = 0;//記錄margin //事件對象(用于綁定移除事件) this._fM = BindAsEventListener(this, this.Move); this._fS = Bind(this, this.Stop); this.SetOptions(options); this.Limit = !!this.options.Limit; this.mxLeft = parseInt(this.options.mxLeft); this.mxRight = parseInt(this.options.mxRight); this.mxTop = parseInt(this.options.mxTop); this.mxBottom = parseInt(this.options.mxBottom); this.LockX = !!this.options.LockX; this.LockY = !!this.options.LockY; this.Lock = !!this.options.Lock; this.onStart = this.options.onStart; this.onMove = this.options.onMove; this.onStop = this.options.onStop; this._Handle = $(this.options.Handle) || this.Drag; this._mxContainer = $(this.options.mxContainer) || null; this.Drag.style.position = "absolute"; //透明 if(isIE && !!this.options.Transparent){ //填充拖放對象 with(this._Handle.appendChild(document.createElement("div")).style){ width = height = "100%"; backgroundColor = "#fff"; filter = "alpha(opacity:0)"; } } //修正范圍 this.Repair(); addEventHandler(this._Handle, "mousedown", BindAsEventListener(this, this.Start)); }, //設(shè)置默認(rèn)屬性 SetOptions: function(options) { this.options = {//默認(rèn)值 Handle: "",//設(shè)置觸發(fā)對象（不設(shè)置則使用拖放對象） Limit: false,//是否設(shè)置范圍限制(為true時(shí)下面參數(shù)有用,可以是負(fù)數(shù)) mxLeft: 0,//左邊限制 mxRight: 9999,//右邊限制 mxTop: 0,//上邊限制 mxBottom: 9999,//下邊限制 mxContainer: "",//指定限制在容器內(nèi) LockX: false,//是否鎖定水平方向拖放 LockY: false,//是否鎖定垂直方向拖放 Lock: false,//是否鎖定 Transparent: false,//是否透明 onStart: function(){},//開始移動(dòng)時(shí)執(zhí)行 onMove: function(){},//移動(dòng)時(shí)執(zhí)行 onStop: function(){}//結(jié)束移動(dòng)時(shí)執(zhí)行 }; Extend(this.options, options || {}); }, //準(zhǔn)備拖動(dòng) Start: function(oEvent) { if(this.Lock){ return; } this.Repair(); //記錄鼠標(biāo)相對拖放對象的位置 this._x = oEvent.clientX - this.Drag.offsetLeft; this._y = oEvent.clientY - this.Drag.offsetTop; //記錄margin this._marginLeft = parseInt(CurrentStyle(this.Drag).marginLeft) || 0; this._marginTop = parseInt(CurrentStyle(this.Drag).marginTop) || 0; //mousemove時(shí)移動(dòng) mouseup時(shí)停止 addEventHandler(document, "mousemove", this._fM); addEventHandler(document, "mouseup", this._fS); if(isIE){ //焦點(diǎn)丟失 addEventHandler(this._Handle, "losecapture", this._fS); //設(shè)置鼠標(biāo)捕獲 this._Handle.setCapture(); }else{ //焦點(diǎn)丟失 addEventHandler(window, "blur", this._fS); //阻止默認(rèn)動(dòng)作 oEvent.preventDefault(); }; //附加程序 this.onStart(); }, //修正范圍 Repair: function() { if(this.Limit){ //修正錯(cuò)誤范圍參數(shù) this.mxRight = Math.max(this.mxRight, this.mxLeft + this.Drag.offsetWidth); this.mxBottom = Math.max(this.mxBottom, this.mxTop + this.Drag.offsetHeight); //如果有容器必須設(shè)置position為relative來相對定位，并在獲取offset之前設(shè)置 !this._mxContainer || CurrentStyle(this._mxContainer).position == "relative" || (this._mxContainer.style.position = "relative"); } }, //拖動(dòng) Move: function(oEvent) { //判斷是否鎖定 if(this.Lock){ this.Stop(); return; }; //清除選擇 window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty(); //設(shè)置移動(dòng)參數(shù) var iLeft = oEvent.clientX - this._x, iTop = oEvent.clientY - this._y; //設(shè)置范圍限制 if(this.Limit){ //設(shè)置范圍參數(shù) var mxLeft = this.mxLeft, mxRight = this.mxRight, mxTop = this.mxTop, mxBottom = this.mxBottom; //如果設(shè)置了容器，再修正范圍參數(shù) if(!!this._mxContainer){ mxLeft = Math.max(mxLeft, 0); mxTop = Math.max(mxTop, 0); mxRight = Math.min(mxRight, this._mxContainer.clientWidth); mxBottom = Math.min(mxBottom, this._mxContainer.clientHeight); }; //修正移動(dòng)參數(shù) iLeft = Math.max(Math.min(iLeft, mxRight - this.Drag.offsetWidth), mxLeft); iTop = Math.max(Math.min(iTop, mxBottom - this.Drag.offsetHeight), mxTop); } //設(shè)置位置，并修正margin if(!this.LockX){ this.Drag.style.left = iLeft - this._marginLeft + "px"; } if(!this.LockY){ this.Drag.style.top = iTop - this._marginTop + "px"; } //附加程序 this.onMove(); }, //停止拖動(dòng) Stop: function() { //移除事件 removeEventHandler(document, "mousemove", this._fM); removeEventHandler(document, "mouseup", this._fS); if(isIE){ removeEventHandler(this._Handle, "losecapture", this._fS); this._Handle.releaseCapture(); }else{ removeEventHandler(window, "blur", this._fS); }; //附加程序 this.onStop(); }};</script><style> #idContainer{ border:10px solid #990000; width:600px; height:300px;}#idDrag{ border:5px solid #C4E3FD; background:#C4E3FD; width:50px; height:50px; top:50px; left:50px;}#idHandle{cursor:move; height:25px; background:#0000FF; overflow:hidden;}</style><div id="idContainer"><div id="idDrag"><div id="idHandle"></div></div></div><input id="idReset" type="button" value="復(fù)位" /><input id="idLock" type="button" value="鎖定" /><input id="idLockX" type="button" value="鎖定水平" /><input id="idLockY" type="button" value="鎖定垂直" /><input id="idLimit" type="button" value="范圍鎖定" /><input id="idLimitOff" type="button" value="取消范圍鎖定" /><br />拖放狀態(tài)：<span id="idShow">未開始</span><script> var drag = new Drag("idDrag", { mxContainer: "idContainer", Handle: "idHandle", Limit: true, onStart: function(){ $("idShow").innerHTML = "開始拖放"; }, onMove: function(){ $("idShow").innerHTML = "left："+this.Drag.offsetLeft+"；top:"+this.Drag.offsetTop; }, onStop: function(){ $("idShow").innerHTML = "結(jié)束拖放"; }});$("idReset").onclick = function(){ drag.Limit = true; drag.mxLeft = drag.mxTop = 0; drag.mxRight = drag.mxBottom = 9999; drag.LockX = drag.LockY = drag.Lock = false;}$("idLock").onclick = function(){ drag.Lock = true; }$("idLockX").onclick = function(){ drag.LockX = true; }$("idLockY").onclick = function(){ drag.LockY = true; }$("idLimit").onclick = function(){ drag.mxRight = drag.mxBottom = 200;drag.Limit = true; }$("idLimitOff").onclick = function(){ drag.Limit = false; }</script></body></html>希望本文所述對大家JavaScript程序設(shè)計(jì)有所幫助。
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