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<div :class=\"classes\" :style=\"styles\" @click=\"back\">\r\n <slot>\r\n <div :class=\"innerClasses\">\r\n <i class=\"ivu-icon ivu-icon-ios-arrow-up\"></i>\r\n </div>\r\n </slot>\r\n </div>\r\n</template>\r\n<script>\r\nimport { scrollTop } from '@/libs/util';\r\nimport { on, off } from '@/libs/tools';\r\nconst prefixCls = 'ivu-back-top';\r\n\r\nexport default {\r\n name: 'ABackTop',\r\n props: {\r\n height: {\r\n type: Number,\r\n default: 400,\r\n },\r\n bottom: {\r\n type: Number,\r\n default: 30,\r\n },\r\n right: {\r\n type: Number,\r\n default: 30,\r\n },\r\n duration: {\r\n type: Number,\r\n default: 1000,\r\n },\r\n container: {\r\n type: null,\r\n default: window,\r\n },\r\n },\r\n data() {\r\n return {\r\n backTop: false,\r\n };\r\n },\r\n mounted() {\r\n // window.addEventListener('scroll', this.handleScroll, false)\r\n // window.addEventListener('resize', this.handleScroll, false)\r\n on(this.containerEle, 'scroll', this.handleScroll);\r\n on(this.containerEle, 'resize', this.handleScroll);\r\n },\r\n beforeDestroy() {\r\n // window.removeEventListener('scroll', this.handleScroll, false)\r\n // window.removeEventListener('resize', this.handleScroll, false)\r\n off(this.containerEle, 'scroll', this.handleScroll);\r\n off(this.containerEle, 'resize', this.handleScroll);\r\n },\r\n computed: {\r\n classes() {\r\n return [\r\n `${prefixCls}`,\r\n {\r\n [`${prefixCls}-show`]: this.backTop,\r\n },\r\n ];\r\n },\r\n styles() {\r\n return {\r\n bottom: `${this.bottom}px`,\r\n right: `${this.right}px`,\r\n };\r\n },\r\n innerClasses() {\r\n return `${prefixCls}-inner`;\r\n },\r\n containerEle() {\r\n return this.container === window ? window : document.querySelector(this.container);\r\n },\r\n },\r\n methods: {\r\n handleScroll() {\r\n this.backTop = this.containerEle.scrollTop >= this.height;\r\n },\r\n back() {\r\n let target = typeof this.container === 'string' ? this.containerEle : document.documentElement || document.body;\r\n const sTop = target.scrollTop;\r\n scrollTop(this.containerEle, sTop, 0, this.duration);\r\n this.$emit('on-click');\r\n },\r\n },\r\n};\r\n</script>\r\n"]}]}
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