总体分三块,ECMAScript,DOM,BOM
ECMAScript:JS的核心语法(ES规范/ECMA-262标准)
DOM:Document Object Model(文档对象模型:对网页当中的节点进行增删改的过程)HTML文档
被当做一颗DOM树来看待 比如 var domObj=document.getElmentById("id")
BOM编程:DOM的顶级对象:document,BOM的顶级对象:window
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