javascript - 在调用 html() 之前是否需要执行 unbind() 或 off()

Question

在调用jQuery之前是否需要对html元素执行jQueryunbind()或off()函数> html() 来避免内存泄漏？

Answer 1

不，这不是必需的。

html 函数负责在设置 innerHTML 之前清除所有内容。

来自 the documentation :

Additionally, jQuery removes other constructs such as data and event handlers from child elements before replacing those elements with the new content.

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实现细节:

html 函数调用empty 其代码在这里:

empty: function() {
    var elem,
        i = 0;

    for ( ; (elem = this[i]) != null; i++ ) {
        // Remove element nodes and prevent memory leaks
        if ( elem.nodeType === 1 ) {
            jQuery.cleanData( getAll( elem, false ) );
        }

        // Remove any remaining nodes
        while ( elem.firstChild ) {
            elem.removeChild( elem.firstChild );
        }

        // If this is a select, ensure that it displays empty (#12336)
        // Support: IE<9
        if ( elem.options && jQuery.nodeName( elem, "select" ) ) {
            elem.options.length = 0;
        }
    }

    return this;
},