发布于 2017-01-21 21:37:12 | 116 次阅读 | 评论: 0 | 来源: 网友投递

这里有新鲜出炉的Javascript教程,程序狗速度看过来!

JavaScript客户端脚本语言

Javascript 是一种由Netscape的LiveScript发展而来的原型化继承的基于对象的动态类型的区分大小写的客户端脚本语言,主要目的是为了解决服务器端语言,比如Perl,遗留的速度问题,为客户提供更流畅的浏览效果。


本篇文章主要是对js通过八个点 拖动改变div大小的实现方法进行了介绍,需要的朋友可以过来参考下,希望对大家有所帮助


<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>Resize</title> 
<style type="text/css"> 
#rRightDown,#rLeftDown,#rLeftUp,#rRightUp,#rRight,#rLeft,#rUp,#rDown{ 
position:absolute;background:#C00;width:6px;height:6px;z-index:5;font-size:0;} 
#rLeftDown,#rRightUp{cursor:ne-resize;} 
#rRightDown,#rLeftUp{cursor:nw-resize;} 
#rRight,#rLeft{cursor:e-resize;} 
#rUp,#rDown{cursor:n-resize;} 
#rRightDown{ bottom:-3px; right:-3px;} 
#rLeftDown{ bottom:-3px; left:-3px;} 
#rRightUp{ top:-3px; right:-3px;} 
#rLeftUp{ top:-3px; left:-3px;} 
#rRight{ right:-3px; top:50%} 
#rLeft{ left:-3px; top:50%} 
#rUp{ top:-3px; left:50%} 
#rDown{ bottom:-3px; left:50%} 
</style> 
</head> 
<body> 
<div id='ss' style="height:100px; width:100px; border:1px solid #000000; position:absolute; left:200px; top:200px;" > 
<div id="rRightDown"> </div> 
<div id="rLeftDown"> </div> 
<div id="rRightUp"> </div> 
<div id="rLeftUp"> </div> 
<div id="rRight"> </div> 
<div id="rLeft"> </div> 
<div id="rUp"> </div> 
<div id="rDown"></div> 
</div> 
<script> 
var Sys = (function(ua){ 
    var s = {}; 
    s.IE = ua.match(/msie ([\d.]+)/)?true:false; 
    s.Firefox = ua.match(/firefox\/([\d.]+)/)?true:false; 
    s.Chrome = ua.match(/chrome\/([\d.]+)/)?true:false; 
    s.IE6 = (s.IE&&([/MSIE (\d)\.0/i.exec(navigator.userAgent)][0][1] == 6))?true:false; 
    s.IE7 = (s.IE&&([/MSIE (\d)\.0/i.exec(navigator.userAgent)][0][1] == 7))?true:false; 
    s.IE8 = (s.IE&&([/MSIE (\d)\.0/i.exec(navigator.userAgent)][0][1] == 8))?true:false; 
    return s; 
})(navigator.userAgent.toLowerCase());

var $ = function (id) {
    return document.getElementById(id);
};

var Css = function(e,o){
    for(var i in o)
    e.style[i] = o[i];
};

var Extend = function(destination, source) {
    for (var property in source) {
        destination[property] = source[property];
    }
};

var Bind = function(object, fun) {
    var args = Array.prototype.slice.call(arguments).slice(2);
    return function() {
        return fun.apply(object, args);
    }
};

var BindAsEventListener = function(object, fun) {
    var args = Array.prototype.slice.call(arguments).slice(2);
    return function(event) {
        return fun.apply(object, [event || window.event].concat(args));
    }
};

var CurrentStyle = function(element){
    return element.currentStyle || document.defaultView.getComputedStyle(element, null);
};

function addListener(element,e,fn){
    element.addEventListener?element.addEventListener(e,fn,false):element.attachEvent("on" + e,fn);
};
function removeListener(element,e,fn){
    element.removeEventListener?element.removeEventListener(e,fn,false):element.detachEvent("on" + e,fn)
};

var Class = function(properties){
    var _class = function(){return (arguments[0] !== null && this.initialize && typeof(this.initialize) == 'function') ? this.initialize.apply(this, arguments) : this;};
    _class.prototype = properties;
    return _class;
};

var Resize =new Class({
    initialize : function(obj){
        this.obj = obj;
        this.resizeelm = null;
        this.fun = null; //记录触发什么事件的索引
        this.original = []; //记录开始状态的数组
        this.width = null;
        this.height = null;
        this.fR = BindAsEventListener(this,this.resize);
        this.fS = Bind(this,this.stop);    
    },
    set : function(elm,direction){
        if(!elm)return;
        this.resizeelm = elm;
        addListener(this.resizeelm,'mousedown',BindAsEventListener(this, this.start, this[direction]));
        return this;
    },
    start : function(e,fun){
        this.fun = fun;
        this.original = [parseInt(CurrentStyle(this.obj).width),parseInt(CurrentStyle(this.obj).height),parseInt(CurrentStyle(this.obj).left),parseInt(CurrentStyle(this.obj).top)];
        this.width = (this.original[2]||0) + this.original[0];
        this.height = (this.original[3]||0) + this.original[1];
        addListener(document,"mousemove",this.fR);
        addListener(document,'mouseup',this.fS);
    },
    resize : function(e){
        this.fun(e);
        Sys.IE?(this.resizeelm.onlosecapture=function(){this.fS()}):(this.resizeelm.onblur=function(){this.fS()})
    },
    stop : function(){
        removeListener(document, "mousemove", this.fR);
        removeListener(document, "mousemove", this.fS);
        window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty();    
    },
    up : function(e){
        this.height>e.clientY?Css(this.obj,{top:e.clientY + "px",height:this.height-e.clientY + "px"}):this.turnDown(e);
    },
    down : function(e){
        e.clientY>this.original[3]?Css(this.obj,{top:this.original[3]+'px',height:e.clientY-this.original[3]+'px'}):this.turnUp(e);    
    },
    left : function(e){
        e.clientX<this.width?Css(this.obj,{left:e.clientX +'px',width:this.width-e.clientX + "px"}):this.turnRight(e);        
    },
    right : function(e){
        e.clientX>this.original[2]?Css(this.obj,{left:this.original[2]+'px',width:e.clientX-this.original[2]+"px"}):this.turnLeft(e)    ;
    },
    leftUp:function(e){
        this.up(e);this.left(e);
    },
    leftDown:function(e){
        this.left(e);this.down(e);
    },
    rightUp:function(e){
        this.up(e);this.right(e);
    },
    rightDown:function(e){
        this.right(e);this.down(e);
    },                
    turnDown : function(e){
        Css(this.obj,{top:this.height+'px',height:e.clientY - this.height + 'px'});
    },
    turnUp : function(e){
        Css(this.obj,{top : e.clientY +'px',height : this.original[3] - e.clientY +'px'});
    },
    turnRight : function(e){
        Css(this.obj,{left:this.width+'px',width:e.clientX- this.width +'px'});
    },
    turnLeft : function(e){
        Css(this.obj,{left:e.clientX +'px',width:this.original[2]-e.clientX+'px'});         
    }        
});
window.onload = function(){
    new Resize($('ss')).set($('rUp'),'up').set($('rDown'),'down').set($('rLeft'),'left').set($('rRight'),'right').set($('rLeftUp'),'leftUp').set($('rLeftDown'),'leftDown').set($('rRightDown'),'rightDown').set($('rRightUp'),'rightUp');
}
</script>
</body>
</html>



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