javascript 里 this.checked = !this.checked;怎么解释?

javascript 里 this.checked = !this.checked;怎么解释? checked="checked"指的是什么意思? CHECK OFF This items have been checked off. Did you have this room checked before we moved in? 英语翻译Scotty checked out this morningin his customary waywith checked是什么 not checked checked leehom的checked out html里的checked属性是什么意思? 谁帮忙解释下javascript:this.disabled = true;this.document.form.sub javascript 关于this javascript语句问题：this['className']?this['className']='nav_swit