jquery實現的一個網頁飄窗小外掛
阿新 • • 發佈:2019-02-14
//定義外掛
!function($){
/**
* Description: jquery飄窗外掛,可自適應瀏覽器寬高的變化
* Author: YZCS
* CreateTime: 2015-04-25
* param: args={startL:default, startT:default, angle:-Math.PI/4, speed: 125}
* 引數說名: startL飄窗初始時距離左邊的距離, startT飄窗初始化距離頂部的距離, angle飄窗初始運動方向, speed運動速度(px/s)
* CopyRight: GPL
*/
$.fn.autoMove = function(args){
//先定義一些工具函式判斷邊距
function isTop(pos, w_w, w_h, d_w, d_h){//飄窗到達上邊距
if(pos.top<=0){
return true;
}else{
return false;
}
}
function isBottom(pos, w_w, w_h, d_w, d_h){//飄窗到達下邊距
if(pos.top>=(w_h-d_h)){
return true;
}else{
return false;
}
}
function isLeft(pos, w_w, w_h, d_w, d_h){//飄窗到達左邊距
if(pos.left<=0 ){
return true;
}else{
return false;
}
}
function isRight(pos, w_w, w_h, d_w, d_h){//飄窗到達右邊距
if(pos.left>=(w_w-d_w)){
return true;
}else{
return false;
}
}
return this.each(function(){
var w_w = parseInt($(window).width()),
w_h = parseInt($(window).height()),
d_w = parseInt($(this).width()),
d_h = parseInt($(this).height()),
d_l = (w_w-d_w)/2,
d_t = (w_h-d_h)/2,
max_l = w_w - d_w;
max_t = w_h - d_h;
//位置及引數的初始化
var setobj = $.extend({startL:d_l, startT:d_t, angle:Math.PI/4, speed:100}, args);
$(this).css({position: 'absolute', left: setobj['startL']+'px', top: setobj['startT']+'px'});
var position = {left: setobj['startL'], top: setobj['startT']};//飄窗位置物件
var that = $(this);
var angle= setobj.angle;
var time = 10;//控制飄窗運動效果,值越小越細膩
var step = setobj.speed * (time/1000);//計算運動步長
var decoration = {x:step*Math.cos(angle), y:step*Math.sin(angle)};//計算二維上的運動增量
var mvtid;
$(window).on('resize', function(){//視窗大小變動時重新設定運動相關引數
w_w = parseInt($(window).width()),
w_h = parseInt($(window).height()),
max_l = w_w - d_w;
max_t = w_h - d_h;
});
function move(){
position.left += decoration.x;
position.top += decoration.y;
if(isLeft(position, w_w, w_h, d_w, d_h)||isRight(position, w_w, w_h, d_w, d_h)){
decoration.x = -1*decoration.x;
}
if(isRight(position, w_w, w_h, d_w, d_h)){
position.left = max_l;
}
if(isTop(position, w_w, w_h, d_w, d_h)||isBottom(position, w_w, w_h, d_w, d_h)){
decoration.y = -1*decoration.y;
}
if(isBottom(position, w_w, w_h, d_w, d_h)){
position.top = max_t;
}
//that.css({left:position.left, top:position.top});
that.animate({left:position.left, top:position.top}, time);//改用jquery動畫函式使其更加平滑
mvtid = setTimeout(move, time);//遞迴呼叫,使飄窗連續運動
}
move();//觸發動作
that.on('mouseenter', function(){ clearTimeout(mvtid) });//新增滑鼠事件
that.on('mouseleave', function(){ move() });
});
}//end plugin definition
}(jQuery);