摘要:
1. 空值:null,undefined(NaN, Not a Number) e.g.: var bestAge=null; //null var currentCount; //undefined,NaN 作比较时,null value==undefined value :window.alert(bestAge==currentCount);//返回true;2. 隐式类型转换: string + number == string + number.toString(); string + boolean == string + boolean.toString(); Boolean . 阅读全文