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this")])])]),t._v(" "),s("li",[s("strong",[t._v("返回值")]),t._v("：无")]),t._v(" "),s("li",[s("strong",[t._v("作用")]),t._v("：监听一个自定义事件，但是只触发一次，在第一次触发之后移除监听器。")])]),t._v(" "),s("h3",{attrs:{id:"off-type-fn"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#off-type-fn"}},[t._v("#")]),t._v(" off(type, fn)")]),t._v(" "),s("ul",[s("li",[s("strong",[t._v("参数")]),t._v("：\n"),s("ul",[s("li",[t._v("{string} type 事件名")]),t._v(" "),s("li",[t._v("{Function} fn 回调函数")])])]),t._v(" "),s("li",[s("strong",[t._v("返回值")]),t._v("：无")]),t._v(" "),s("li",[s("strong",[t._v("作用")]),t._v("：移除自定义事件监听器。只会移除这个回调的监听器。")]),t._v(" "),s("li",[s("strong",[t._v("示例")]),t._v("：")])]),t._v(" "),s("div",{staticClass:"language-javascript extra-class"},[s("pre",{pre:!0,attrs:{class:"language-javascript"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" BScroll "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("from")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token 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function"}},[t._v("on")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v("'scroll'")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" handler"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n\nscroll"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("off")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v("'scroll'")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" handler"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),s("h2",{attrs:{id:"事件-vs-钩子"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#事件-vs-钩子"}},[t._v("#")]),t._v(" 事件 VS 钩子")]),t._v(" "),s("p",[t._v("基于 2.x 的架构设计，以及对 1.x 事件的兼容，我们延伸出两个概念 ——『"),s("strong",[t._v("事件")]),t._v("』以及『"),s("strong",[t._v("钩子")]),t._v("』。从本源上来说它们都是属于 "),s("code",[t._v("EventEmitter")]),t._v(" 实例，只是叫法不一样。下面我们从节选的源码来讲解一下：")]),t._v(" "),s("div",{staticClass:"language-typescript extra-class"},[s("pre",{pre:!0,attrs:{class:"language-typescript"}},[s("code",[t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("export")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("default")]),t._v(" BScrollCore "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("EventEmitter")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n hooks"),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" EventEmitter\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),s("ul",[s("li",[s("p",[s("strong",[t._v("BScrollCore")])]),t._v(" "),s("p",[t._v("本身继承了 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EventEmitter 的实例。它派发出来的，我们都称之为『"),s("strong",[t._v("钩子")]),t._v("』。")]),t._v(" "),s("div",{staticClass:"language-js extra-class"},[s("pre",{pre:!0,attrs:{class:"language-js"}},[s("code",[t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" BScroll "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("from")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v("'@better-scroll/core'")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" bs "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("new")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("BScroll")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v("'.wrapper'")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token 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punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// 监听 bs 的 enable 钩子")]),t._v("\n bs"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("hooks"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("on")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v("'enable'")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=>")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])])])]),t._v(" "),s("p",[t._v("相信现在大家对两者有了更好的区分吧，『"),s("strong",[t._v("事件")]),t._v("』是为了 1.x 的兼容考虑，用户一般关注的是事件的派发，但是如果要编写一款插件，你应该更加关注『"),s("strong",[t._v("钩子")]),t._v("』。")]),t._v(" "),s("h2",{attrs:{id:"事件"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#事件"}},[t._v("#")]),t._v(" 事件")]),t._v(" "),s("p",[t._v("在 2.0 当中，BetterScroll 事件与 1.x 的事件是拉齐的，只有 BetterScroll 会派发『"),s("strong",[t._v("事件")]),t._v("』，如果你在编写插件的时候需要暴露事件，你也应该通过 BetterScroll 来派发，"),s("RouterLink",{attrs:{to:"/zh-CN/plugins/how-to-write.html"}},[t._v("详细的教程看这")]),t._v("，目前的事件分为下面几种：")],1),t._v(" "),s("ul",[s("li",[s("p",[s("strong",[t._v("refresh")])]),t._v(" "),s("ul",[s("li",[s("strong",[t._v("触发时机")]),t._v("：BetterScroll 重新计算")])]),t._v(" "),s("div",{staticClass:"language-js extra-class"},[s("pre",{pre:!0,attrs:{class:"language-js"}},[s("code",[t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" BetterScroll 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