提高getLocation函数的ie8兼容性 #344
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getLocation函数内容转义后为`return Object.assign({}, source.location, {/*略*/});`。
当使用babel-polyfill提供Object.assign语法支持时，会报错：`Object.prototype.propertyIsEnumerable: 'this' 不是 JavaScript 对象`。
使用for循环替换Object.assign进行属性复制。
判断条件写反了，去掉`!`
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getLocation函数内容转义后为
return Object.assign({}, source.location, {/*略*/});。当使用babel-polyfill提供Object.assign语法支持时，会报错：
Object.prototype.propertyIsEnumerable: 'this' 不是 JavaScript 对象。使用for循环替换Object.assign进行属性复制。