例子:<input />
//法一
var val1 = document.getElementsByName("startDate")[0].value;
//法二
var val2 = document.getElementById("startDate").value;
//法三
var startDate = $('#startDate').val();
例子:<input />
//法一
var val1 = document.getElementsByName("startDate")[0].value;
//法二
var val2 = document.getElementById("startDate").value;
//法三
var startDate = $('#startDate').val();
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