js类型判断

vue的类型判断

/*
    判断数据类型
    @param s {Object Number Function Symbol}
*/
export const type = s => Object.prototype.toString.call(s).slice(8, -1).toLowerCase();
[
  'String',
    'Array',
    'Undefined',
    'Boolean',
    'Number',
    'Function',
    'Symbol',
    'Object'
].forEach(v=>type['is'+v] = s => type(s) === v.toLowerCase())
eg: type.isNumber(123) // true
    type.isString(123) // false

es5代码

var type = function (s) {
    return Object.prototype.toString.call(s).slice(8, -1).toLowerCase();
};
var types = [
    'String',
    'Array',
    'Undefined',
    'Boolean',
    'Number',
    'Function',
    'Symbol',
    'Object'
];
types.forEach(function (str) {
    type['is' + str] = function (val) {
        return type(val) === str.toLowerCase();
    };
});
module.exports = type;