JavaScript数据类型检测代码分享_javascript技巧

/**
* param：o表示检测的值
* return：返回字符串"undefined"、"number"、"boolean"、"string"、"function"、"regexp"、"array"、"date"、"error"、"object"或"null"
*/
function typeOf(o){
var _toString = Object.prototype.toString; //获取对象的toString()方法引用
//列举基本数据类型和内置对象类型，你还可以进一步补充该数组的检测数据类型范围
var _type ={
"undefined" : "undefined",
"number" : "number",
"boolean" : "boolean",
"string" : "string",
"[object Function]" : "function",
"[object RegExp]" : "regexp",
"[object Array]" : "array",
"[object Date]" : "date",
"[object Error]" : "error"
}
return _type[typeof o] || _type[_toString.call(o)] || (o ? "object" : "null"); //通过把值转换为字符串，然后匹配返回字符串中是否包含特定字符进行检测
}
//应用示例：
var a = Math.abs;
alert(typeOf(a)); //返回字符串"function"