<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>任意值的运动框架</title&g ...
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>任意值的运动框架</title> <style> div { float: left; width: 200px; height: 200px; margin: 20px; background-color: yellow; border: 1px solid black; font-size: 14px; filter: alpha(opacity=30); /*IE*/ opacity: 0.3; /*火狐,chrome*/ } </style> <script> window.onload = function () {//Div变高 var oDiv1 = document.getElementById('div1'); oDiv1.onmouseover = function () { startMove(this, 'height', 400); }; oDiv1.onmouseout = function () { startMove(this, 'height', 200); };//Div变宽 var oDiv2 = document.getElementById('div2'); oDiv2.onmouseover = function () { startMove(this, 'width', 400); }; oDiv2.onmouseout = function () { startMove(this, 'width', 200); };//改变文字大小 var oDiv3 = document.getElementById('div3'); oDiv3.onmouseover = function () { startMove(this, 'fontSize', 30); }; oDiv3.onmouseout = function () { startMove(this, 'fontSize', 14); };//修改透明度 var oDiv4 = document.getElementById('div4'); oDiv4.onmouseover = function () { startMove(this, 'opacity', 100); }; oDiv4.onmouseout = function () { startMove(this, 'opacity', 30); }; }; //属性值的获取函数 function getStyle(obj, name) { if (obj.currentStyle) { return obj.currentStyle[name]; } else { return getComputedStyle(obj, false)[name]; } }//运动框架 var timer = null; function startMove(obj, attr, iTarget) { //obj代表对象,attr代表目标属性,iTarget代表设定的属性目标值 clearInterval(obj.timer); //每次执行函数之前清除定时器,保证每次只有一个定时器在工作 obj.timer = setInterval(function () { var cur = 0; if (attr == 'opacity') { //透明度属性的获取 cur = Math.round(parseFloat(getStyle(obj, attr)) * 100); //Math.round针对IE7出现小数的问题 } else { cur = parseInt(getStyle(obj, attr)); //非透明度的属性值获取 } var speed = (iTarget - cur) / 6; speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed); //向上取整(速度为正值)和向下取整(速度为负值) if (cur == iTarget) { clearInterval(obj.timer); //达到目标值时清除定时器 } else { if (attr == 'opacity') { obj.style.filter = 'alpha(opacity=' + (cur + speed) + ')'; //IE浏览器 obj.style.opacity = (cur + speed) / 100; //火狐,chrome } else { obj.style[attr] = cur + speed + 'px'; //非透明度属性值 } } }, 30); } </script></head><body><div id="div1">变高</div><div id="div2">变宽</div><div id="div3">I Love JavaScript!</div><div id="div4">修改透明度</div></body></html>
原标题:JS运动学习笔记
关键词:JS
*特别声明:以上内容来自于网络收集,著作权属原作者所有,如有侵权,请联系我们:
admin#shaoqun.com
(#换成@)。