一：行内样式：
var mario=document.getElementById(“mario”);
var left=mario.style.left;
二.非行内样式
var mario2=document.getElementById(“mario2”);
var left2=mario2.currentStyle?mario2.currentStyle[‘left’]:getComputedStyle(mario2,null)[‘left’]
在这里插入代码片<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta name="Generator" content="EditPlus®"><meta name="Author" content=""><meta name="Keywords" content=""><meta name="Description" content=""><title>Document</title></head><style>body{margin:0;padding:0;}#wrap{width:500px;height:300px;background:skyblue;}#mario2{width:100px;height:100px;left:10px;top:120px;position:absolute;}</style><script>function Mario(){this.move=function (val){var mario=document.getElementById("mario");var mario2=document.getElementById("mario2");var left=mario.style.left;var left2=mario2.currentStyle?mario2.currentStyle['left']:getComputedStyle(mario2,null)['left']alert(left2);left=Number(left.substr(0,left.length-2))var width=mario.style.width;width=Number(width.substr(0,width.length-2))switch(val){case 1:if(left+width>=500){alert('已到达边界，不能再移动');}else if(left+width>480&&left+width<500){mario.style.left='400px';}else{mario.style.left=(left+20)+'px';}break;case 0:if(left<=0){alert('已到达边界，不能再移动');}else if(0<left&&left<20){mario.style.left='0px';}else{mario.style.left=(left-20)+'px';}break;}}}var mario=new Mario();</script><body><div id="wrap"><img id="mario" style='width:100px;height:100px;left:10px;top:10px;position:absolute;' src="image/1.jpg"/><img id="mario2" src="image/1.jpg"/></div><div id="controlcenter"><input type="button" value="向右移动" onclick="mario.move(1)"/></div><div id="controlcenter"><input type="button" value="向左移动" onclick="mario.move(0)"/></div></body></html>
