多维数组转一维数组：[1,[2,3]] ==》 [1,2,3]

function tran(array){if(Object.prototype.toString.call(array) != '[object Array]'){alert(Object.prototype.toString.call(array) + "非数组")return ;}var newArr = [];function trans(arr){ for (var num = 0; num < arr.length;num ++){ if(arr[num].length){ trans(arr[num]); } else { newArr.push(arr[num]); } } } trans(array); return newArr; }

 

[javascript] 

 

op = Object.prototype,ostring = op.toString,...function isFunction(it) {return ostring.call(it) === '[object Function]';}function isArray(it) {return ostring.call(it) === '[object Array]'; }

 

Object.prototype.toString  与 typeof 区别：

typeof

在使用 typeof 运算符时采用引用类型存储值会出现一个问题，无论引用的是什么类型的对象，它都返回 "object"。

ECMA 对Object.prototype.toString的解释（ ）

Object.prototype.toString ( )

When the toString method is called, the following steps are taken:

If the this value is undefined, return "[object Undefined]".
If the this value is null, return "[object Null]".
Let O be the result of calling ToObject passing the this value as the argument.
Let class be the value of the [[Class]] internal property of O.
Return the String value that is the result of concatenating the three Strings "[object ", class, and "]".

 

var oP = Object.prototype,toString = oP.toString;console.log(toString.call([123]));//[object Array]console.log(toString.call('123'));//[object String]console.log(toString.call({a: '123'}));//[object Object]console.log(toString.call(/123/));//[object RegExp]console.log(toString.call(123));//[object Number]console.log(toString.call(undefined));//[object Undefined]console.log(toString.call(null));//[object Null]

参考：，，