用工小程序前端代码
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316 B

'use strict';
module.exports = {
isString: function (arg) {
return typeof arg === 'string';
},
isObject: function (arg) {
return typeof arg === 'object' && arg !== null;
},
isNull: function (arg) {
return arg === null;
},
isNullOrUndefined: function (arg) {
return arg == null;
}
};