js中resize事件怎么用

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1、当浏览器窗口调整到新的高度或宽度时，会触发resize事件。

2、在window(窗口)上触发，因此可以通过JavaScript或元素中的onresize特性来指定事件处理程序。

实例

/** * Created by taozh on 2017/5/6. * taozh2982@gmail.com */var EleResize = {    _handleResize: function (e) {        var ele = e.target || e.srcElement;        var trigger = ele.__resizeTrigger__;        if (trigger) {            var handlers = trigger.__z_resizeListeners;            if (handlers) {                var size = handlers.length;                for (var i = 0; i < size; i++) {                    var h = handlers[i];                    var handler = h.handler;                    var context = h.context;                    handler.apply(context, [e]);                }            }        }    },    _removeHandler: function (ele, handler, context) {        var handlers = ele.__z_resizeListeners;        if (handlers) {            var size = handlers.length;            for (var i = 0; i < size; i++) {                var h = handlers[i];                if (h.handler === handler && h.context === context) {                    handlers.splice(i, 1);                    return;                }            }        }    },    _createResizeTrigger: function (ele) {        var obj = document.createElement('object');        obj.setAttribute('style',            'display: block; position: absolute; top: 0; left: 0; height: 100%; width: 100%; overflow: hidden;opacity: 0; pointer-events: none; z-index: -1;');        obj.onload = EleResize._handleObjectLoad;        obj.type = 'text/html';        ele.appendChild(obj);        obj.data = 'about:blank';        return obj;    },    _handleObjectLoad: function (evt) {        this.contentDocument.defaultView.__resizeTrigger__ = this.__resizeElement__;        this.contentDocument.defaultView.addEventListener('resize', EleResize._handleResize);    }};if (document.attachEvent) {//ie9-10    EleResize.on = function (ele, handler, context) {        var handlers = ele.__z_resizeListeners;        if (!handlers) {            handlers = [];            ele.__z_resizeListeners = handlers;            ele.__resizeTrigger__ = ele;            ele.attachEvent('onresize', EleResize._handleResize);        }        handlers.push({            handler: handler,            context: context        });    };    EleResize.off = function (ele, handler, context) {        var handlers = ele.__z_resizeListeners;        if (handlers) {            EleResize._removeHandler(ele, handler, context);            if (handlers.length === 0) {                ele.detachEvent('onresize', EleResize._handleResize);                delete  ele.__z_resizeListeners;            }        }    }} else {    EleResize.on = function (ele, handler, context) {        var handlers = ele.__z_resizeListeners;        if (!handlers) {            handlers = [];            ele.__z_resizeListeners = handlers;             if (getComputedStyle(ele, null).position === 'static') {                ele.style.position = 'relative';            }            var obj = EleResize._createResizeTrigger(ele);            ele.__resizeTrigger__ = obj;            obj.__resizeElement__ = ele;        }        handlers.push({            handler: handler,            context: context        });    };    EleResize.off = function (ele, handler, context) {        var handlers = ele.__z_resizeListeners;        if (handlers) {            EleResize._removeHandler(ele, handler, context);            if (handlers.length === 0) {                var trigger = ele.__resizeTrigger__;                if (trigger) {                    trigger.contentDocument.defaultView.removeEventListener('resize', EleResize._handleResize);                    ele.removeChild(trigger);                    delete ele.__resizeTrigger__;                }                delete  ele.__z_resizeListeners;            }        }    }}

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