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js代码:
var gaga = function(wrap){ var wrap = document.getElementById(wrap); var hoverDir = function(e){ var w = wrap.offsetWidth, h = wrap.offsetHeight, x = ( e.clientX - wrap.offsetLeft - ( w / 2 ) ) * ( w > h ? ( h / w ) : 1 ), y = (e.clientY - wrap.offsetTop - (h / 2)) * (h > w ? (w / h) : 1), // 上(0) 右(1) 下(2) 左(3) direction = Math.round( ( ( ( Math.atan2( y, x ) * ( 180 / Math.PI ) ) + 180 ) / 90) + 3 ) % 4, eventType = e.type, dirName = new Array('上方','右侧','下方','左侧'); if( e.type == 'mouseover' || e.type == 'mouseenter' ){ wrap.innerHTML = dirName[direction] + '进入'; }else{ wrap.innerHTML = dirName[direction] + '离开'; } } if( window.addEventListener ){ wrap.addEventListener( 'mouseover',hoverDir,false ); wrap.addEventListener( 'mouseout',hoverDir,false ); }else if( window.attachEvent ){ wrap.attachEvent( 'onmouseenter',hoverDir ); wrap.attachEvent( 'onmouseleave',hoverDir ); } } // gaga('gagagaga1'); gaga('gagagaga2');
效果如下
次方法兼容所有主流浏览器,包括IE6
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原文地址:http://blog.csdn.net/gaga06/article/details/43271065