// 移除选中项
function removeOption() {
var selectIndex = []
var options = null
var selectBox = document.getElementById('selLocation')
for (var i = 0, len = selectBox.options.length; i < len; i++) {
options = selectBox.options[i]
if (options.selected) {
selectIndex.push(i)
}
}
selectIndex.forEach((element) => {
document.getElementById('selLocation').remove(selectIndex.length-1)
});
}