unique-interface/src/util.js

无UI组件库

/**
 * @file 工具包
 *
 * @export isUndef {function}
 *
 * @author soulran(xr@ethercap.com)
 */

// type
const _class2type = {}, _toString = Object.prototype.toString;
"Boolean Number String Function Array Date RegExp Object Error Symbol".split( " " ).forEach(function(name){
    _class2type["[object " + name + "]"] = name.toLowerCase();
});
export function type(val){
    return typeof val === "object" || typeof val === "function" ?
    _class2type[ _toString.call(val) ] || "object" :
    typeof val;
}

/**
 * Convert an Array-like object to a real Array.
 */
export function toArray(list, start){
    start = start || 0;
    var i = list.length - start;
    var ret = new Array(i);
    while (i--) {
        ret[i] = list[i + start];
    }
    return ret;
}

/**
 * Merge several object/array to a target object/array.
 */
export function merge(target){
    toArray(arguments, 1).forEach(function(source){
        Object.keys(source).forEach(key => { target[key] = source[key] });
    });
    return target;
}

/**
 * Deep merge several object/array to a target object/array.
 */
export function deepMerge(target){
    var key, stype;
    toArray(arguments, 1).forEach(function(source){
        for(key in source){
            stype = type(source[key]);
            if(stype === 'array' || stype === 'object'){
                if(type(target[key]) !== stype){
                    target[key] = stype === 'array' ? [] : {};
                }
                deepMerge(target[key], source[key]);
            } else {
                target[key] = source[key];
            }
        }
    });
    return target;
}