var userAgent = navigator.userAgent;                              //取得瀏覽器的userAgent字符串   var isOpera = userAgent.indexOf("Opera") > -1;                         //判斷是否Opera瀏覽器   var isIE = userAgent.indexOf("compatible") > -1 && userAgent.indexOf("MSIE") > -1 && !isOpera; //判斷是否IE瀏覽器   var isEdge = userAgent.indexOf("Edge") > -1 && !isIE;                     //判斷是否IE的Edge  var?isFF?=?userAgent.indexOf("Firefox")>-1                           //判斷是否Firefox瀏覽器??  var?isSafari?=?userAgent.indexOf("Safari")>-1&&?userAgent.indexOf("Chrome")==-1;        //判斷是否Safari瀏覽器??  var?isChrome?=?userAgent.indexOf("Chrome")>-1&&?userAgent.indexOf("Edge")==-1;         //判斷Chrome瀏覽器?？

if(isFF){    console.log('火狐')    $('#parent').width((windowWidth -320)*(1.01749));  }else if(isChrome){     console.log('谷歌')    $('#parent').width((windowWidth -320)*(1.01749));  }else if(isIE){     console.log('ie10-ie5')    $('#parent').width((windowWidth -320)*(1.01720));  }else if(isEdge){    console.log('edge')    $('#parent').width((windowWidth -320)*(1.02224));  }else{    console.log('ie11和其他瀏覽器')    $('#parent').width((windowWidth -320)*(1.01816));  }