//使用em单位

		var scaleObj = {

			documentEle :　document.documentElement,

			deviceWidth　: document.documentElement.clientWidth,

			scale : 0,

			resetPage :  function(){

				this.scale = this.deviceWidth/6.4;

				this.documentEle.style.fontSize = this.scale + 'px';

			},

			init :function(falseCode){

				this.ChangeDevW();

				this.deviceWidth < 640 ? this.resetPage() : falseCode;

			},

			ChangeDevW : function(){

				this.deviceWidth = this.documentEle.clientWidth;

			}

		};

		window.onload = function(){

			scaleObj.init(false);

		}

		window.onresize = function(){

			scaleObj.init(scaleObj.documentEle.style.fontSize = 625 + '%');

		};

		//使用px单位

		var vieWport = {

			phoneWidth : parseInt(window.screen.width),

			phoneScale : this.phoneWidth / 640,

			ua : navigator.userAgent,

			init : function(){

				 	if (/Android (\d+\.\d+)/.test(this.ua)) {

			        var version = parseFloat(RegExp.$1);

			        if (version > 2.3) {

			            document.write('<meta name="viewport" content="width=640, initial-scale= ' + this.phoneScale + ' ,minimum-scale = ' + this.phoneScale + ', maximum-scale = ' + this.phoneScale + ', target-densitydpi=device-dpi">')

			        } else {

			            document.write('<meta name="viewport" content="width=640, initial-scale= ' + this.phoneScale + ' , target-densitydpi=device-dpi">')

			        }

			    } else {

			        document.write('<meta name="viewport" content="width=640, user-scalable=no, target-densitydpi=device-dpi">')

			    }

			 }

		}

		vieWport.init();