这是
实验性技术
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浏览器兼容性表格
要小心谨慎在生产中使用这之前。
loadEventStart
只读特性返回
timestamp
representing the time value equal to the time immediately before the load event of the current document is fired.
perfEntry.loadEventStart;
A
timestamp
representing a time value equal to the time immediately before the load event of the current document is fired.
The following example illustrates this property's usage.
function print_nav_timing_data() {
// Use getEntriesByType() to just get the "navigation" events
var perfEntries = performance.getEntriesByType("navigation");
for (var i=0; i < perfEntries.length; i++) {
console.log("= Navigation entry[" + i + "]");
var p = perfEntries[i];
// dom Properties
console.log("DOM content loaded = " + (p.domContentLoadedEventEnd - p.domContentLoadedEventStart));
console.log("DOM complete = " + p.domComplete);
console.log("DOM interactive = " + p.interactive);
// document load and unload time
console.log("document load = " + (p.loadEventEnd - p.loadEventStart));
console.log("document unload = " + (p.unloadEventEnd - p.unloadEventStart));
// other properties
console.log("type = " + p.type);
console.log("redirectCount = " + p.redirectCount);
}
}
| 规范 | 状态 | 注释 |
|---|---|---|
|
Navigation Timing Level 2
The definition of 'loadEventStart' in that specification. |
工作草案 | 初始定义。 |
| 桌面 | 移动 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
loadEventStart
|
Chrome 57 | Edge 12 | Firefox 58 | IE 不支持 No | Opera 44 | Safari 不支持 No | WebView Android 57 | Chrome Android 57 | Firefox Android 58 | Opera Android 43 | Safari iOS 不支持 No | Samsung Internet Android 7.0 |
完整支持
不支持
实验。期望将来行为有所改变。
PerformanceNavigationTiming