html，，选项1，选项2，，，document.getElementById('first').onchange = function() {，var second = document.createElement('select');，second.id = 'second';，document.body.appendChild(second);，// 根据第一个选择框的值生成第二个选择框的选项，}，，``html，，选项1，选项2，，，document.getElementById('first').onchange = function() {，var second = document.createElement('select');，second.id = 'second';，document.body.appendChild(second);，// 根据第一个选择框的值生成第二个选择框的选项，}，，``Powered By Z-BlogPHP 1.7.3
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