javascript连=符号

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<script type="text/javascript">var a = {n:1};  var b = a; // 持有a，以回查  //a.x = a = {n:2};  a = a.x = {n:2}; console.log(a.x);// --> undefined  console.log(b.x);// --> {n:2}</script>

a.x = a = {n:2};  a = a.x = {n:2};

<span style="color: rgb(102, 102, 102); font-family: "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "WenQuanYi Micro Hei", "Microsoft Yahei", sans-serif; font-size: 13px; background-color: rgb(246, 246, 246);">a = a.x = {n:2}和a.x = a = {n:2}的结果是一致的原因是，属性访问表达式优先级高于“=”号，无论哪种赋值方式都是先执行a.x，</span>

<span style="color: rgb(102, 102, 102); font-family: "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "WenQuanYi Micro Hei", "Microsoft Yahei", sans-serif; font-size: 13px; background-color: rgb(246, 246, 246);">所以a 指向是{n:1}，添加属性x之后,被重新赋值{n:2}对象。</span>

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