1、push()将元素依次添加至数组;
2、join()将数组转换成字符串,里面可以带参数分隔符,默认【,】

<script type = text/javascript>
$(document).on('click', '.sure', function() {
var =[];
var highlights = new Array(); //或者var highlights = [];
$('.plan-ipt input').each(function(){
if($(this).val()!='')
{
highlights.push($(this).val());
}
});
var arr = highlights.join('&');  //arr是以&分割的字符串
$("#all_plan").val(arr);
})
</script>

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