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Diffstat (limited to 'files')
| -rw-r--r-- | files/zh-cn/web/javascript/reference/global_objects/object/assign/index.html | 33 |
1 files changed, 0 insertions, 33 deletions
diff --git a/files/zh-cn/web/javascript/reference/global_objects/object/assign/index.html b/files/zh-cn/web/javascript/reference/global_objects/object/assign/index.html index 4b8696d2ab..616406e3e5 100644 --- a/files/zh-cn/web/javascript/reference/global_objects/object/assign/index.html +++ b/files/zh-cn/web/javascript/reference/global_objects/object/assign/index.html @@ -251,39 +251,6 @@ console.log(copy); // { foo:1, get bar() { return 2 } } </pre> -<h2 id="Polyfill">Polyfill</h2> - -<p>此{{Glossary("Polyfill","polyfill")}}不支持 symbol 属性，因为ES5 中根本没有 symbol ：</p> - -<pre class="brush: js">if (typeof Object.assign != 'function') { - // Must be writable: true, enumerable: false, configurable: true - Object.defineProperty(Object, "assign", { - value: function assign(target, varArgs) { // .length of function is 2 - 'use strict'; - if (target == null) { // TypeError if undefined or null - throw new TypeError('Cannot convert undefined or null to object'); - } - - let to = Object(target); - - for (var index = 1; index < arguments.length; index++) { - var nextSource = arguments[index]; - - if (nextSource != null) { // Skip over if undefined or null - for (let nextKey in nextSource) { - // Avoid bugs when hasOwnProperty is shadowed - if (Object.prototype.hasOwnProperty.call(nextSource, nextKey)) { - to[nextKey] = nextSource[nextKey]; - } - } - } - } - return to; - }, - writable: true, - configurable: true - }); -}</pre> <h2 id="Specifications">规范</h2> |