angular 兼容ie11 ie11兼容

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兼容一（new Date()用法)

new Date('2018-01-01 00:00:00').getHours();
new Date('2018-01-01 00:00:00').getMinutes();
new Date('2018-01-01 00:00:00').getSeconds();

在IE11下需要这么写

 let myMinTime = new Date('2018-01-01');
 myMinTime.setHours(0);
 myMinTime.setMinutes(0);
 myMinTime.setSeconds(0);

myMinTime.getHours();
myMinTime.getMinutes();
myMinTime.getSeconds();

兼容二（IE11下下载文件问题)：

     uA = window.navigator.userAgent;
     isIE = /msie\s|trident\/|edge\//i.test(this.uA) && !!("uniqueID" in document || "documentMode" in document || ("ActiveXObject" in window) || "MSInputMethodContext" in window);
    download(item) {
        let param = {
            param: item.url.toString()
        }
        this.upgradeService.download(param, {}, res => {
            var a = document.createElement("a");
            var blob = new Blob([res], {type: "application/octet-stream"});
            a.href = URL.createObjectURL(blob);
            a.download = item.fileName;
            if (this.isIE) {
              // 兼容IE11无法触发下载的问题
              window.navigator.msSaveBlob(blob, item.fileName);
            } else {
              a.click();
            }
        });
    }