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no-layout
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| <!DOCTYPE html> | |
| <html> | |
| <body> | |
| <script> | |
| var NoLayout = (function () { | |
| var layoutGuardCount = 0; | |
| function wrapMethod(name, propertyName) { | |
| if (NoLayout.InProduction) | |
| return; | |
| var proto = window[name].prototype; | |
| var descriptor = Object.getOwnPropertyDescriptor(proto, propertyName); | |
| var originalGetter = descriptor.value; | |
| var NoLayoutWrapper = function () { | |
| if (layoutGuardCount) | |
| throw new Error(name + '.prototype.' + propertyName + ' should not be called'); | |
| return originalGetter.apply(this, arguments); | |
| } | |
| descriptor.value = NoLayoutWrapper; | |
| Object.defineProperty(proto, propertyName, descriptor); | |
| } | |
| wrapMethod('Element', 'getClientRects'); | |
| return function (callback) { | |
| layoutGuardCount++; | |
| callback(); | |
| layoutGuardCount--; | |
| } | |
| })(); | |
| NoLayout.InProduction = false; | |
| NoLayout(function () { | |
| document.body.getClientRects(); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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