兼容Object.assign封装

在网上看到一个工具类，Object.assign兼容封装,记录一下。

直接上代码

// 部分低端机型没有Object.assign，与其封装一个方法，不如内置一个polyfill
if (!Object.assign) {
    Object.defineProperty(Object, 'assign', {
      enumerable: false,
      configurable: true,
      writable: true,
      value: function(target: any) {
            'use strict';
            if (target === undefined || target === null) {
                throw new TypeError('Cannot convert first argument to object');
            }
    
            const to = Object(target);
            for (let i = 1; i < arguments.length; i++) {
                let nextSource = arguments[i];
                if (nextSource === undefined || nextSource === null) {
                    continue;
                }
                nextSource = Object(nextSource);
        
                const keysArray = Object.keys(Object(nextSource));
                for (let nextIndex = 0, len = keysArray.length; nextIndex < len; nextIndex++) {
                    const nextKey = keysArray[nextIndex];
                    const desc = Object.getOwnPropertyDescriptor(nextSource, nextKey);
                    if (desc !== undefined && desc.enumerable) {
                        to[nextKey] = nextSource[nextKey];
                    }
                }
            }
            return to;
        }
    });
}

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