JS-实用方法整理

 ???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."); ???????????????} ???????} ???}