2019獨角獸企業重金招聘Python工程師標準>>>
"~" operator in javascript. For anyone else who also didn't know what it does: it converts -1 to 0,可以節省用來比較-1的情況,如
if (~event.origin.indexOf('http://yoursite.com')) { // The data has been sent from your site // The data sent with postMessage is stored in event.data console.log(event.data); }