[js] 写个方法获取屏幕的DPI

 (function() {var arrDPI = new Array();if ( window.screen.deviceXDPI) {arrDPI[0] = window.screen.deviceXDPI;arrDPI[1] = window.screen.deviceYDPI;}else {var tmpNode = document.createElement( "DIV" );tmpNode.style.cssText = "width:1in;height:1in;position:absolute;left:0px;top:0px;z-index:99;visibility:hidden";document.body.appendChild( tmpNode );arrDPI[0] = parseInt( tmpNode.offsetWidth );arrDPI[1] = parseInt( tmpNode.offsetHeight );tmpNode.parentNode.removeChild( tmpNode );}console.dir(arrDPI);return arrDPI;
})()

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