浏览器判断

ie678=!+"v1";
ie678=!-[1,];
ie678='v'=='v';
ie678=('a-b'.split(/(~)/))[1]=="b"
ie678=0.9.toFixed(0)=="0"
ie678=/w/.test('u0130') 
ie8=window.toStaticHTML
ie9=window.msPerformance
ie678=0//@cc_on+1;
ie67=!"1"[0] //利用IE6或IE5的字符串不能使用数组小标的特征
ie8=!!window.XDomainRequest;
ie9=document.documentMode&&document.documentMode===9;
ie10 = window.navigator.msPointerEnabled;
ie11 = !!window.MSInputMethodContext;


!+"v1" || document.documentMode&&document.documentMode===9   6、7、8、9、为true