怎么Post一个关联数组给PHP，要求不用jquery
如何Post一个关联数组给PHP，要求不用jquery
例如
foo[key1]=value1;
foo[key2]=varlue2;
如何能post给PHP，能从$_POST['foo']将关联数组取出来。
网上查了一下，都是使用juery作的，但我前面用一个Ajax池，只使用了XMLHttpRequest对象实现，
没有使用jquery，如果改用jquery，改动较大，所以问一下不用jquery如何实现这个功能。
------解决方案--------------------
你总是要构造参数串的
foo[key1]=value1&foo[key2]=varlue2&...
------解决方案--------------------
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