// 深拷貝 // 判斷類型 console.log(checkType(1)); //[object Number] console.log(checkType('1')); //[object String] console.log(checkType(true)); //[object Boo ...
// 深拷貝
function deepClone(obj) { if (obj == null || typeof obj !== 'object') { return obj; } switch (Object.prototype.toString.call(obj)) { case '[object Array]': { var result = new Array(obj.length); for (var i = 0; i < result.length; ++i) { result[i] = deepClone(obj[i]); } return result; } case '[object Error]': { var result = new obj.constructor(obj.message); result.stack = obj.stack; // hack... return result; } case '[object Date]': case '[object RegExp]': case '[object Int8Array]': case '[object Uint8Array]': case '[object Uint8ClampedArray]': case '[object Int16Array]': case '[object Uint16Array]': case '[object Int32Array]': case '[object Uint32Array]': case '[object Float32Array]': case '[object Float64Array]': case '[object Map]': case '[object Set]': return new obj.constructor(obj); case '[object Object]': { var keys = Object.keys(obj); var result = {}; for (var i = 0; i < keys.length; ++i) { var key = keys[i]; result[key] = deepClone(obj[key]); } return result; } default: { throw new Error("Unable to copy obj! Its type isn't supported."); } } }
// 判斷類型
function checkType(obj) { return Object.prototype.toString.call(obj); }console.log(checkType(1)); //[object Number] console.log(checkType('1')); //[object String] console.log(checkType(true)); //[object Boolean] console.log(checkType(undefined)); //[object Undefined] console.log(checkType(null)); //[object Null] console.log(checkType([1, 2, 3])); //[object Array] console.log(checkType({ a: 1, b: 2 })); //[object Object] console.log(checkType(function() {})); //[object Function]
//隨機字元串
function randomString(length) { var type = Object.prototype.toString.call(length); if (type === '[object Number]' || type === '[object Undefined]') { length = length || 18; var random_number = new Date().getTime().toString(36); var base_charts = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678'; var chart_length = base_charts.length; var str = ''; for (var i = 0; i < length; i++) { str += base_charts.charAt(Math.floor(Math.random() * chart_length)); } if (length <= 8) { return str; } else { return str.substr(0, str.length - 8) + random_number; } } else { alert('輸入錯誤') } }