javascript - If, else if 语句不起作用(仅显示 if)

Question

它只显示 if 语句。没有到达第二或第三条语句。 HTML 部分仅显示“commentE”值。

var totalAmount = (conversion * sAmount);
totalAmount = $("#totalAmount").val(totalAmount);

var myadvice;
myadvice = $("#myadvice").val();

var great;
great = localStorage.getItem("great");

var commentE;
commentE = localStorage.getItem("commentE");

var between;
between = localStorage.getItem("between");

var betweenb;
betweenb = localStorage.getItem("betweenb");

var commentB;
commentB = localStorage.getItem("commentB");

var less;
less = localStorage.getItem("less");

var commentL;
commentL = localStorage.getItem("commentL");

if (totalAmount >= great) {
    myadvice = $("#myadvice").val(commentE);
} else if ((totalAmount >= between) && (totalAmount <= betweenb)) {
    myadvice = $("#myadvice").val(commentB);
} else if (totalAmount <= less) {
    myadvice = $("#myadvice").val(commentL);

这些是 HTML 部分(用于获取输入的索引页)

<div data-role="navbar">
    <ul>
        <li>
            <label for="between">Between</label>
            <div class="ui-grid-a">
                <div class="ui-block-a">
                    <input type="text" 
                        name="between" id="between" placeholder="between" value="200">
                </div>
                <div class="ui-block-b">
                    <input type="text" 
                        name="betweenb" id="betweenb" placeholder="between" value="499">
                 </div>
            </div>
        </li>
        <li>
            <label for="commentB">Comment</label>
            <input type="text" name="commentB" 
                id="commentB" placeholder="comments" value="OK">
        </li>
    </ul>
</div>

这些应该是结果(结果页面显示上一页的输入

    <div data-role="main" class="ui-content">
        <div class="ui-field-contain">
            <div data-role="fieldcontainer">
                <label for="advice"> My Advice is as follows: </label>
                <input type="text" name="advice" id="advice">
            </div>
        </div>
    </div>
</b>

Answer 1

If else 语句为 executed in order ，例如:

total = 10;
greater = 5;
between = 4;
if(total >= greater) {
  console.log("comment a");
} else if (total >= between) {
  console.log("comment b");
}

结果将是comment a，因为在total >= Between之前尝试了total >= Greater。两个语句都是 true，但首先尝试第一个语句，并且只执行一个语句的内容。运行 if else 语句内的代码后，执行的下一个内容位于 if else 组下方。