若语句给出了未定义的结果

我构建了一个表单，根据用户的选择显示结果。我试图把一个if语句放在一起，它将在选择特定值时输出数据表1。我希望有人选择525、134和290给我数据表1，否则给我数据单3。这是我的代码：

<form name="test" id="test"">
    <label for="select1">Height in (mm)</label>
        <select name="division-select" id="height">
        <option label="Please Select"></option>
            <option value="525">525 or less</option>
            <option value="645">645 or less</option>
            <option value="1265">up to 1265</option>
            <option value="1270">more than 1265</option>
        </select>
        <label for="select1">Width in (mm)</label>
        <select name="division-select" id="width">
        <option label="Please Select"></option>
            <option value="134w">134 or less</option>
            <option value="190w">190 or less </option>
            <option value="290w">290 or less</option>
            <option value="328w">328 or less</option>
            <option value="420w">420 or more</option>
        </select>
        <Br>
        <br>
        <label for="select1">Depth in (mm)</label>
        <select name="division-select" id="depth">
        <option label="Please Select"></option>
            <option value="134d">134 or less</option>
            <option value="190d">190 or less </option>
            <option value="290d">290 or less</option>
            <option value="328d">328 or less</option>
            <option value="420d">420 or more</option>
        </select>
        <br><br>
        <h2>Or select by load</h2>
        <label for="select1">Load in (kN)</label>
        <select name="division-select" id="load">
            <option label="Please Select"></option>
            <option value="2-5">2.5 or less</option>
            <option value="5">5 or less </option>
            <option value="10">10 or less</option>
            <option value="25">25 or less</option>
            <option value="50">50 or more</option>
        </select>
        <br>
        <p><input type="button" onclick="calculate();" value="Find your Datasheet" /><input type="button" onclick="formReset()" value="Reset form"></p>
</form>
<div id="result">
</div>
<script type="text/javascript">
function calculate() {
    var height = document.getElementById('height').value;
    var width = document.getElementById('width').value;
    var depth = document.getElementById('depth').value;
    var load = document.getElementById('load').value;
    if (document.getElementById("height").value == "") {
        var heightmsg = "Please select your sample's height.";
        document.getElementById("result").innerHTML = heightmsg;
        return false;
    }
    if (document.getElementById("width").value == "") {
        var widthmsg = "Please select your sample's width.";
        document.getElementById("result").innerHTML = widthmsg;
        return false;
    }
    if (document.getElementById("depth").value == "") {
        var depthmsg = "Please select your sample's depth.";
        document.getElementById("result").innerHTML = depthmsg;
        return false;
    }
    if (height === "525" && width === "134" && depth === "290") {
        if (height === "525" && width === "290" && depth === "134") {
            var str = '<a href="#">Download your Datasheet 1</a>';
        } else {
            var str = '<a href="#">Download your Datasheet 3</a>';
        }
    } else if (height == 1270) {
        var str = "This configuration is beyond the standard range of top-load testers. Please contact Mecmesin Sales to discuss ways to meet your requirements.";
    }
    document.getElementById("result").innerHTML = str;
}
function formReset() {
    document.getElementById("test").reset();
}
</script>

提前谢谢。