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in Technique[技术] by (71.8m points)

如下js,“在为您转接人工服务,请稍候...",为什么没有自动消失啊,而是在屏幕显示出来了?

<!DOCTYPE html>
<html>
<head>
<script src="lib/jquery-3.4.1.min.js" ></script>
<script src="lib/zepto.js" ></script>
</head>
<body>
<div class ="scroller"></div>
</body>
</html>
<script>
function insertMessageText(message, success, error) {
    var content = $('<div class="l-row l-center"></div>');
    content.html(message);
    $(".scroller").append(content);
    if ($.isFunction(success)) {
        success.apply(content.get(0), arguments);
    }
}
insertMessageText("<i class='mui-icon icon-tongzhi'></i>正在为您转接人工服务,请稍候...",
    function() {
        setTimeout(function() {
            $(this).remove();
        }, 2000);
    })

                
</script>

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1 Answer

0 votes
by (71.8m points)

的确是楼上说的 this 指向的问题

insertMessageText("<i class='mui-icon icon-tongzhi'></i>正在为您转接人工服务,请稍候...",
    function() {
        var that = this;
        setTimeout(function() {
            $(that).remove();
        }, 2000);
    })

下面这样也可以

insertMessageText("<i class='mui-icon icon-tongzhi'></i>正在为您转接人工服务,请稍候...",
    function() {
        setTimeout(() => {
            $(this).remove();
        }, 2000);
    })

这样还可以

insertMessageText("<i class='mui-icon icon-tongzhi'></i>正在为您转接人工服务,请稍候...",
    function() {
        setTimeout(function() {
            $(this).remove();
        }.bind(this), 2000);
    })

问题就是因为你用function包裹了,里面的指向 windows 或者 undefined 了。
es6 方案就是箭头函数,老的方案就是 that 保存一下。


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